Description of the goods or services required
Strip and replace moorland block boundary fence on the west side of Cerniau, Y Berwyn.
The length and location of fencing to be replaced or installed is generally shown in the map above (from point A to C). Fencing to be replaced is shown in blue.
All materials to be supplied by the appointed contractor.
The approximate lengths of fenceline from point A to C is ~4110m
NB the final section of the fence from B to C may be excluded (~700m).
GENERAL FENCING SPECIFICATION – Lake Vyrnwy
Purpose
To install a fence that is stock proof for new-born native breed lambs, sheep, ponies and cattle. Including, as necessary, the removal of old fencing and line clearance works. All operations to be undertaken in a manner that minimises impact to the site.
The site is designated as a Special Area for Conservation (SAC) and any damage and repair is the responsibility of the contractor.
Specification
Delivery of materials: If the contractor is in any doubt as to whether materials delivered to site meet the specifications laid out in the contract, the contractor is to contact the undersigned before these materials are used.
The work consists of the following main elements:
1. To take down existing fencing and remove all materials from site
2. To clear line to allow installation of new fence. All cut material will be chipped or neatly stacked under standing scrub.
3. To install fencing, field gates and water gates to the following specification;
Gates and Fencing Materials
1. All steel to be galvanised to British Standard.
2. All timber to be softwood pressure treated to British Standard, any cut surface to be treated with recommended sealant – no post tops to be cut.
3. All round posts to be peeled and pointed. The diameter measurements of round posts are a minimum along the entire length of the post.
4. All timber to be from a sustainable British source.
(Ø = diameter)
High Tensile Barbed Wire Fencing
1. Overall fence height 1100mm, posts to be placed every 2m with a straining post every 100m.
2. The fence will be made up of one top line of barbed wire, and stock netting placed approx. 25mm above a line of plain wire bottom wire.
3. Strainers, box assembly, max 400m apart, minimum of 1.30m into the ground. Multiple boxes to be used as ground conditions dictate, at the contractor’s discretion. Horizontal bars to be rebated max 10mm, fixed by galvanised 12mm Ø, 300mm steel pins, at a height that brings it between the 2 top wires, pins should be driven into a pre-drilled hole of 10mm to prevent moisture from entering the timber. 3.15mm HT plain wire strained around assembly and joined with crimp sleeves. The 12mm Ø pin on the strutting post should be left with 25mm showing to put the diagonal wire over.
4. Turning posts at every change of direction, less than 30 degrees. Minimum of 1.30m in the ground. Strainer assembly to be used at turns exceeding 30 degrees and as ground conditions dictate, at the contractor's discretion.
5. Intermediate posts max 3m apart. Minimum 0.75m into the ground.
6. Tie downs to be used on all types of post as necessary. An intermediate post should be installed at 45º to the vertical post to a depth of at least 0.9m. Tie down post should be fixed with a 12mm galvanised pin using a pre-drilled 10mm hole, between 100mm and 200mm above ground level.
7. 1 top line of barbed wire, Titan high tensile barbed wire. Top wire to be 1050mm above ground level.
8. Wires – high tensile wire 9inch gauge. Should be joined by tying to the manufacturers approved specification or by using a crimp sleeve designed for the task, 2.5 / 3.15 sleeve or 3-4 sleeve and crimped to the manufacturers specification. We do not consider Gripples to be appropriate. All wire to be galvanised to British Standard.
9. Staples, 40mm x 3.15mm galvanised, barbed, angled across the grain of the timber, driven to a depth that does not crush the galvanising, does allow wire to move as it expands and contracts (or gets pressured by stock), but does not allow enough room for wire to rattle in the wind, which can damage the galvanising.
10. To install Splays to the following specification; Splays to be installed to secure fence and dyke junctions for all livestock (including sheep and lambs), posts 2.4m x 100mm x 125mm weather topped, no more than 2.1m apart.
11. To install Water Gates to the following specification. The objective of these gates is to provide a stock barrier, but allowing for the removal of gate and rails when flooding may occur – to avoid obstructing a large flow of water. Square vertical posts; length 2000mm, tops 125mm x 125mm, set at first break of bank on either side of drain. 2400-(+)mm x 100mm x 50mm rails, set at 350mm intervals, the lower rail to be 50mm above ground level, the top rail to be 1050mm above ground level, in line with overall height of stock fencing 1100mm. Hurdle to be made from 100mm x 50mm rails to fit drain profile and attached to bottom rail with galvanised chain. Rails to be held in place by galvanised nails. Water gates to be agreed before erection.
12. To install metal field gates to the following specifications: all gates should be hung with the hook to drive inverted so that the gate cannot be lifted off, the latch should be set so that the weight of the gate is borne on both posts. Gates should be installed at a height so that the largest gap is no more than 87mm. All gate posts to be isolated from strainers, any gap larger than 100mm to be filled with intermediate post and five 87mmx 38mm rails at spacings shown in figure 1. Rails should only be nailed to a post, and either strainer or gate post, so that if one moves it does not move the other. This cost should be included in gate price.
13. RSPB expects Contractors to use their discretion during the installation of fencing on RSPB reserves. If, within one year of completion, the fencing should fail to maintain tension, due to movement of strainers, turning posts, or if any of the posts lift as they have not been sufficiently tied down, RSPB expect contractors to return and make good within 6 weeks of written notification.
Working Practice
1. The work on RSPB reserves requires personnel who are able to follow direction and take steps to ensure that during operations to secure the future of the site they are not doing anything to damage it.
2. The contractor is expected to ensure all those on site, working under the direction of the contractor, have a copy of the specification, and work to it.
3. Tracking across the site is to be kept to a minimum. Vehicle entrance and access routes are to be agreed with the Site Manager prior to commencement of work.
4. Contractors are expected at all times to work within the provisions of all relevant health and safety regulations.
5. The Society takes very seriously the requirements for following HSE requirements with regards to all machinery. All machinery operators must be qualified with the appropriate NPTC certificate and wear the necessary PPE at all times whilst using the machinery on site. We are unable to offer work to people who cannot agree to follow this requirement – please ensure full documentation is supplied to the Society with the contract, and those on site are aware of the restriction.
6. Particular care for the safety of the public should be exercised at all times. A safety plan should be undertaken and agreed with the Society in writing prior to the start of work on each site where footpath diversions and work programming can be agreed if required.
Access
1. The principal access route to the work areas is along the unclassified public highway from Foel on the A458. There is the possibility of alternative access through the NRW owned Dyfnant Forest. Access is to be agreed with the RSPB prior to commencement of works. Particular care should be taken to keep any private or shared access routes in good condition and any damage will be made good to the satisfaction of the Society by the contractor before final payment is made.
2. Access around the work area should be agreed with the RSPB prior to commencement of works, but an overall plan should be incorporated into the working methods agreed with the Society as outlined above.
3. The felling of trees to facilitate access to the work site will be kept to a minimum.
Your quote should be emailed to jon.pike@rspb.org.uk by 13/11/2026
If you wish to discuss any aspect of this quote prior to submitting, or visit the site, please email jon.pike@rspb.org.uk.
Yours faithfully
Jon Pike
Senior Site Manager, Lake Vyrnwy
RSPB
Name of Company
Are you self employed? Yes 0 No 0 (Please tick as appropriate)
Address:
Telephone:
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VAT registration number (if applicable)
Name of person applying on behalf of the company
Are you able to meet the specification in full? If so please give details below
If not please state any differences in goods / service offered
Specification met? Yes0 /No0 (tick as appropriate)
Contractors should clearly state below the working methods and equipment that will be used in the contract at each Site. Also, any additional information, such as alternative methods with prices.
Failure to comply with these provisions could result in disqualification
Working Method - Include as much detail as possible
Number of operators
Please name staff who will be supervising the contract on site for the duration of the works, and detail their experience of work on sensitive habitats
Line Clearance
Take down of derelict fencing materials (to include storage details before removal and destination of materials)
Method:
Detail how you will minimise tracking around the site during the take down operation and what vehicles you will bring on site to do this
How will you deal with the following?
Fence posts :
Wire/Netting :
Fencing
Detail the methodology you will use to install fencing and associated infrastructure. Detail how you will minimise tracking around the site and what vehicles you will use during this operation.
Cost
Fence removal and replacement £/m £ + VAT
Fence removal only £/m £ + VAT
Total cost for providing goods/services, as outlined in specifications £ + VAT
Added Value
As well as any charity rate that you may be able to offer, the RSPB is always open to corporate partnerships that deliver benefit to your organisation, the RSPB and nature. Working as part of your CSR agenda we can provide opportunities for fundraising, secondments, interns and volunteering, offering your staff both personal and career development opportunities. We also welcome all forms of gifts in kind as valuable contributions to our work.
Suppliers should provide details of any associated added value features/services/gifts in kind available to the RSPB under the terms of this Quote. (Attach separate document if needed).
Please note, added value donations will not be part of the criteria we use to decide on which supplier to choose.
Terms and Conditions
The basis of the contractual agreement between RSPB and the applicant is detailed in the RSPB Terms and Conditions – please click on this link to download. In applying for this work you are explicitly agreeing to be bound by these Terms and Conditions for the duration of the contract. If you require any alterations to these Terms and Conditions please state your issues below. (Attach separate document if needed)
The RSPB expects that all suppliers it works with to adhere to certain ethical and environmental standards. Please download the RSPB Ethical and Environmental Procurement Policy and tick this box if you agree to be bound by its terms and conditions 0
Signed
On behalf of
Date
Please note: a name added in an electronic document is functionally equivalent to a signature.
NOTE: To register your interest in this notice and obtain any additional information please visit the Sell2Wales Web Site at https://www.sell2wales.gov.wales/Search/Search_Switch.aspx?ID=172571.
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