ok guys is the roof lining easily replaced in a mk 2.5 focus titanium ?

I'd reckon you need to remove the A,B and C pillar covers, sun blinds, grab handles and roof light(s) then the lining should drop away.
It's reasonably rigid so usually supports itself unlike the old style cloth ones that used to have reinforcing ribs and copious amounts of glue.

ah so should be easy to the right person then as friend accidently burnt a wee mark in it flicking out his ash so there is now no smoking at all in my car

Make him do it as a punishment then.

he is paying for it was going to try and be nice and get one off a scrapped focus like bit will see wat happens