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Hi maggie, As with most mains sockets there is a gate that covers the live & neutral socket holes to prevent kids poking things in, the longer earth pin on the plug moves it out of the way so that the rest of the pins can fit into the socket. It may be that with it being outside a bit of grit or similar is fouling this and preventing the plug going in. With all the power disconnected to the van try a flat blade screwdriver in the top earth socket and see if it opens.

Dave