Not happy with the answer I got from the CLC:
"The water has come in from the brick clean high pressure wash and not from a leak."
I don't even know how to reply!
(and as suspected, they're saying the doorknob holes are fine, with the deadbolt going in at 1300mm and the handle going in at 1100. But cosmetic isn't bothering me as much as the leak. Don't tell me that's not a leak if water got in and wasn't supposed to!