Ok just finished yesterday doing a repair on loom mentioned. First a visit to local scrap yard with snips for cable, rip plastic away from rear rhs piller where seat belt connects, cut wire as low as possible and also at top, you now have good wire the same colors code to replace damaged, on your car remove trim on rhs top of rear door, unplug rubber umbilical from both sides, remove seat belt bolt as then piller plastic trim. Strip back loom coating to reveal cable, we now have to remove the damaged cable by cutting out and joining in new section, by either solderimg or the way I did it with good in line crimps, leave extra cable length, tape up on completion. Took me about an hour but would have cost a fortune in a garage, wire cost a quid and now my rear door locks, curtesy lights work and most important my rear wiper works again, dead chuffed!