12s ancillary socket

hi all im wanting to fit a 12s ancillary socket to my 51 plate freelander td4 i no you can get one that plugs straight in to the loom in the back light so of i go to see mr lr to get one well he wants £60 for it hell i no i can get all the bits for about £15 and crimp in to the wiring myself, does anyone have a wiring diagram it needs to be the up todate one as the caravan i tow is a 2005 and ther is a difference with one of the earths i believe any help and advice will be gratefully received Ian PS merry Christmas and a happy new year to you all.

Personally speaking even though i'm an electrical engineer i'd pay £60. Any joints you add in your wiring will corode eventually, so stick to the plug in loom.

To be fair £60 aint a bad price.

na sorry £60 is an extortionate price and to be fair crimping in is the tried and tested way of doing it so still looking for a wiring diagram