Direct Line arranged for a company to come out, assess and expose the damaged area.
The same day another crew appeared with dehumidifier and massive fan. Those ran most of the day for two weeks costing about £75 which was reimbursed.
We then asked for a cheque for the amount quoted by their builders and got our own in.
I'm sure most insurance companies do the same sort of thing BUT, you have to phone them, I don't know if they make allowances for folk who can't be harassed to ring.
It'll only take five minutes to get the ball rolling.