The builders were doing light work in the same room not on the roof or anything like that - I may have to replace the coax and all connectors. Does anybody think the TV hardware might be damaged by dust ?
It would take a great deal to disrupt them . I will comment thus. It seems that you need technical hands on help to resolve the issue if you are not willing/able to make physical checks your self. So you need to get a TV installer in. The fact that you appeared not to take reasonable precaution to protect your property whilst the work was under taken is down to you. So please do not slag off folk whilst we try to help.