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If you have cavity walls (unlikely in your case unless it's in a more recent part of the building) then it could be old style foam cavity wall insulation which oozed out of a gap in the brick/blockwork when it was being installed.This has the same appearance and texture of oasis.

We have a flat roof extension which is about 25 years old and has a cold-deck roof. There is some rockwool type insulation between the joists which I can see trough the ceiling rose hole but I would like to improve on this and bring the roof up to current standards. Rather than converting it...