Well after about three hours of pulling, pushing, levering, cutting and lots of other ‘ings I managed to separate the top layer of saloon roof from the bottom layer. True to my concerns I found the balsawood core had disintegrated over more than two-thirds of the roof.
I have ordered new foam core from Trident Foams which will arrive hopefully today (Tuesday). So now I am going to put in some temporary roof supports and clean off the old loose stuff ready for resin and new core tomorrow or Thursday/Friday.
Video available soon!