Hi all, I've been moving the roof trim to find the source of a water leak into the boot - it's looking like the usual suspect of the seams at the end of the gully - and I can't get the trim that fits in the gully to lie down snugly against the roof again (see photo).
Any suggestions as to how I get it to lie down flat again? Also, is the trim essential to keep water out, or is it cosmetic to hide the join?
Thanks in advance.
