Thanks, I was guessing around 20K mark based on some old posts (2007) I read on here where comparisons were being made by members between Welsh/Spanish Villa Del Ray-Del Carmen/Random Green slates. Seems Welsh are the ones to use but also the most expensive.
I'll get some local quotes in nearer...
my semi-detached house in Garforth is over 100years old, no insulation or roof felt and some roten timbers which have lead to the roof dipping and leaking. whats a ball park price to take off the roof replace the shot timbers, felt, insulate and slate it all? the semi is about 15m long x 12m...