So it's a case of one step forward two back today unfortunately.
When putting the boot lock in I've managed to distort the panel a little when trying to get the retaining clip to seat - super annoyed at myself. Will need to get my PDR guy out to see if he can massage it flat or at least flatter.
You can see the distortions here, its worse on the top. Nothing more annoying that something that was completely avoidable.
On to the next drama, no idea how this happened but at some point the boot latch has snapped and someone has welded it up. The only reason I noticed was because I was cleaning it - not sure why I have never noticed it before.
I think this has been like this for ages, because the pin that stopped the barrel from over rotating has been gone for a long time and the boot would still open when you turned the key, usually a few times around

.
When I was fixing up the barrel I made a new pin from the shaft of a rivet and banged it in so the barrel only rotates 90 degrees like its supposed to. I also fixed up the return spring because that was popped out. What's happening now though is the paddle on the barrel that contacts the release on the latch (the welded part) doesn't contact, it's been welded in the wrong spot, I think it's lower and outward of where it needs to be - you can feel the barrel paddle tickling it at the end of it's rotation but not enough to release it.
Long story short I need a new latch - anyone got a spare that I could buy off them?