Thanks for your reply, Ed.
The house has plasterboard walls on the inside, then various membranes, insulation etc and also the timber frame with studs. Then timber cladding on the outside, no concrete blocks or brick.
Do I understand you correctly that it is up to the person applying for insurance to supply all possible points of information, even if no relevant hints (in this case concerning timber cladding) can be found in schedules or is anywhere mentioned by the insurer ?
Sorry, that's rather a long sentence!
maharani