On 14 July, 23:08, "John" wrote:
I have had a flue relocated and the tiles have been replaced - but I am left
with a ragged hole in the sarking felt.

Does it matter - if so, how can I minimise any problems?

It should have been fixed before the tiles were put on. There's not a
lot can be done now. If a tile cracks, water will come in the house.