Well, once again this great forum has saved my bacon and kept a few £s in my wallet and out of the dealer's!
Here is my original post, which lasted for all of 14 minutes before Ed had PMed me!
Wanted: Passenger side rear door lock for Golf mk5 GTIHuge thanks to Matto for the brilliant in-depth 'how to' guide, without which I wouldn't have even attempted it!
Huge thanks to Eddie-NL for sorting me out with a replacement and getting it delivered next day at this time of year!
Huge thanks to Stealthwolf for your additional advice!
All is back together and working well. Few iffy moments during re-assembly.. Couldn't get the bl**dy white plastic cover back on without a fair bit of swearing and scraped knuckles and finally, didn't realise that the handle pull doesn't release until you've tightened up the T20 and heard the tension be taken up!
Really chuffed to have it sorted - thanks all and have a great Christmas and New Year!
Paul.