I know it is a bit of a 'how long is a bit of string' question but....
I live in a 1933 3 bed semi and the roof tile are small ones with mortar on the underside which is crumbling away. There are a few holes and misaligned tiles which need attention but I am thinking a new roof may be due - plus would give us clean tidy storage. Have investigated Renotherm etc but discounted it following much advice. Any idea of rough costs for a new roof?