We've had someone round to fix the roof as we have been having guttering issues and some slates coming off. The roofer (who seems genuine and has good reviews on one of those sites) has said the slates are crumbling and the batons are wrecked and we need a whole new roof. He's recommended fibre cement tiles as they're a similar weight to slate. Our house is a 1905 detached and I don't think much has been done to the roof since it was built. They're quoting about £15,000 plus scaffolding cost. We're a bit gutted they can't save the slate as online everyone seems to suggest they last forever but he did show us that a lot were crumbling. Does this seem reasonable for a new roof and something we should go ahead with?