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LeadFarmer, at the moment it is acting like a dummy socket and making a tidy(ish) plug in the hole that is hopefully waterproof!
I returned the van to storage yesterday as I am in for an operation - having my Gall Bladder removed today!
So I will piggy back an electrical supply from an existing socket that is under the bench seat a few feet away. I will probably put a junction box in to simplify installation.
Thanks to members relating their accidents to make me feel better, it takes a little of the embarrassment and I am a little less annoyed with myself !
There are loads of Caravan Club sites where you can do that. https://www.caravanclub.co.uk/globalassets/pdfs/content/uk-holidays/Seasonal--Storage-pitches/CMC-seasonal-facilities-prices-and-booking-form.pdf