I recently had a towbar with 13-pin electrics installed and since then the 12-volt socket on the left-hand side of the boot (next to the removable torch light which does still work) is no longer working. I'm due for a Skoda service next week - should I ask the dealer to look at it? Has anyone else had this issue when fitting an aftermarket tow bar? Thanks.

Whoever fitted your tow bar would have needed access behind the rear panels, so they’ve probably either forgot to reconnect the socket when re fitting, or blown the fuse.