We moved into a lovely 1926 edwardian property in Sept, building survey commented a few minor repairs to roof but otherwise in good condition. Developed a leak (minor) a couple of weeks ago and have had to have scaffolding to assess the damage, there are a couple of slipped tiles. Anyway the roofer suggested I start to consider in the short to medium term having a complete reroof. I suppose it's not a complete shock due to the age of the house but I was lead to believe slate lasts forever. Also we have no membrane which is not completely unusual for the age of the house but are well insulated. Anyway any experts out there? What do you think?