I just wanted to say that this thread was really, really useful, and I have changed boot, doors and ignition using it.
The how to guide was really helpful for the ignition switch in particular. For a ungifted amatuer there were some squeaky bum moments when the footwells were covered in screws, steering wheel, indicator stalks etc and new barrel would not go all the way in, but went in after persevering.
Thanks everyone.