Pdub,
While I can't speak to what foams are available in England, your comment highlights my concern.
The Standards to which the foams may comply is very likely to be one or other of the various civil tests.
My experience over the past 25 years or so in Australia, but looking at materials sourced both locally and imported, is that the existence of a domestic Standard compliance means nothing. When tested to the relevant aircraft Standard, the fabric might perform well, or go up like a bonfire. The latter is the more usual observation.
Please, just make sure that you test the prefered materials first - by batch lot. You ought not to give any reliance to domestic or commercial test requirement compliance.
Ask yourself why the airlines don't go to the local department store for their upholstery supplies ......
[This message has been edited by john_tullamarine (edited 06 June 2001).]