This is a serious problem with the S1/S2 my S1 roof under neath is fucked although this hasn't come through to the exterior surface....yet! Will take a pic underneath later to show you the extent. Very bad design what where ford thinking!
I would love to re-skin my roof but Ford do not sell the skins anymore and I haven't yet found a pattern part company that do them either.
May have to roof chop a mk3/4 escort in the scrappies