SLx Outdoor Extension Lead Waterproof, 20m, 2 Socket Extension Reel, Heavy Duty Extension Cable, Thermal Cut Out, IP54 Rated, Double Socket, UK Outdoor Plug, Extension Lead for Christmas Lights Garden : Amazon.co.uk:
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)) :
Bayer BEX30M15A 30m 250V 15A Heavy Duty Extension Lead