16A Outdoor Sockets With Extension Cable 1M TO 30M, 2 Gang For Camping Caravan Motor Home Weatherproof Storm Outside Plug Sockets Waterproof Electric Box Double Switched 13 A IP66 (40 Metre (40M)) :
SLx Outdoor Extension Lead, 40m, 4 Socket Extension Reel, Heavy Duty Extension Cable, Thermal Cut Out, Extension Lead for Garden Lawn Mower Office, 13A Fused UK Plug : Amazon.co.uk: DIY & Tools
40m Compact Red 16A 3-phase extension lead – Xavelec
40m RCD protected 4 gang socket 2 5mm cable extension lead