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dagger
that said check out a product i will be using shortly called "topcem"
http://cscscreeding.co.uk/images/uploads/207_topcem_gb.pdf
http://cscscreeding.co.uk/images/uploads/207_topcem_gb.pdf
View all of the UK tiling forum threads, questions and discussions here.
The polystyrene is there for a reason....insulation..that is what is known as a floating floor...The quickest option and probably the cheapes is to frame the floor out( fixed) and then lay 22mm ply and keep the insulation...Then use an uncoupling membrane for thermal stress issues associated with timber floors and stone tiles...
Yep....but but you have to protect the frame from damp..as the DPM is under the polystyrene..
Floating floors like this can also be used in flats for the purpose of sound proofing so if not on the ground floor won't always have a DPM. just something to think about, but I'm not sure if GTG lives in a flat yet