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Thank you for your reply , when i posted this question i had not eaten for two days. I bumped into one of the men that is working on the roof yesterday when getting my wheelie bin in and i ask about my tiles that are now sticking up.
He has told me that he will seal them in before he has finished. i think they have cracked a few of my tiles , i should have taken a photograph before they started.
They started on next doors roof last friday and they are still working on it . They did not work on last weekend so i think it will be Monday before they come back .
Once again thank you for your reply.