Qualification system with call for competition for the registration of SSE plc suppliers, contractors and service providers (vendors) belonging to several categories and including Tunnels Consultancy (4.6.12), Rail Tunnel Doors (1.54.11), Tunnelling & Shafts (4.1.7) and Trenchless Pipe Laying – Microtunnelling (4.3.10). SSE plc and its subsidiaries and affiliates reserve the right to use or to not use the UVDB system (Utilities Vendor Database). Contact SSE plc, attn UVDB Team, Perth, tel +44 1235838058, e-mail sse@achilles.com. http://www2.nationalgrid.com/Contact-us/Procurement. Electronic submission of tenders and requests to participate: http://www.sse.com/PotentialSuppliers/. Visit http://ted.europa.eu/udl?request=Seek-Deliver&language=en&docid=138847-2015. Ref.n. SSE Plc-QSN-Works-April 2015. 17/15.