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Hi and many thanks for your reply.
I have never noticed if there was mould in the rubber seal and when I moved out I paid for a full professional cleaning. He complained that there was mould in the rubber seal despite the cleaning so I send them again where at this point he told me that this is not cleanable so he got an offer for a replace - £100 for a rubber seal which costs £20!
He will be withholding the money from the deposit scheme. After reading your e-mail I think I can try to pursuade him that this is normal wear and tear and if he doesn't accept, then ask him to get me three more offers, or split the cost. If this doesn't work then we go to dispute. Thing is, I had a good relationship so far.