This jobs going alright, the roof turned out to be fake stone, there massive concrete slates, held on with a single nail in the middle at the top. Once we got the first two rafters done we was onto it. The method we are doing is 2 rows of 8 in landscape, on the rafter we bolt to we are stripping the slates from the top to expose all the rafter then re-building from the bottom up with the hooks, flashing and slate. Only done 20 hooks and already used 12m code 3 @300mm wide. just going to buy another 2 rolls, this has cost approx £240 in total plus vat on its own, so in the future when the prices are leaner its something im not going to forget.
Will post pictures when its done.
Chow