Well, today I tried sourcing the leak I have in the boot. Whilst I locked myself in there with the tailgate plastic cover off, my mum poured water over the rear.
I noticed very large amounts of water coming in through the rear lock barrel. Not the barrel itself, but the plastic cylinder it goes in.
That cylinder also has a lot of play it in, it leads me to believe maybe a gasket or something has broken off...
Any ideas if the rear lock should allow water in, and if the rear lock should move about a lot?