2 metres of HEAVY DUTY 7 Core 12S Grey Cable for Caravan Towing Electrics | eBay
7 Pin 12S Socket 2m Cable | Fieldfare Trailer Centre | UK - Fieldfare Trailer Centre
Netagon Twin Electric (12N/12S) Car to Caravan/Trailer Towing Adaptor - 7-PIN TO 13-PIN (W/LID ON 7-PIN PLUGS) Extension Cable Adaptor Lead Connector Socket Plug : Amazon.co.uk: Automotive
Ultra Power 12S Adapter Board - Electronics from 3DXR UK