13A weatherproof single socket extension lead (RCD option) – Tough Leads
Masterplug EXS13410/WP-MS 4 socket 13A Blue Extension lead, 10m | DIY at B&Q
2 Gang IP66 RCD Protected 20M Outdoor Extension Lead
1 Gang IP66 Waterproof Outdoor Extension Lead 25M
STATUS 1 Socket Extension Lead | 5m Green Waterproof Extension Cable |13 amp Weatherproof Extension Socket | 1W5M13AIP54S6: Amazon.co.uk: DIY & Tools
Twin Weatherproof Mains Outdoor Extension Lead IP66 2 Socket 5m to 25m 2 Gang | eBay
Outdoor Waterproof Extension Lead 1 Gang 20M Extra Long Extension Cord IP66 Waterproof Garden Extension Cable Outside Use Single Switched Weatherproof Sockets: Amazon.co.uk: Electronics & Photo