Thanks for getting back to me.
The work was done sometime last year. As far as I know they don't have any proof except for the say so of the roofer you carried out the work.
Here is the insert from their letter to me below.
To answer both question - NO.
I have not reviewed the tiles myself to see if this is indeed the cause. I was planning on getting an independent roofer to come to assess the tiles and to verify it is indeed the cause of the problem.
If he says no, and they continue to the work done, am I still liable?
Regarding the downpipe, definitely not. The pipe was installed because of the lack of water clearing. Thus creating an overflow which was causing the water to come down the walls, so the pipe was installed to help channel the water away from the walls.
However, until this is too verified by another roofer I am not accept it.
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