RichardS wrote:

Yes, in fact I was only talking about Kingspan as a well-known brand - would
have investigated Celotex et al and almost certainly the seconds merchants
before buying the stuff.

I'll look up Ecotherm, though. Thanks.

Do a search through yell.com for insulation wholesalers or simmilar.

I was able to get A1 45mm Cellotex for only £3 / sheet more than
"seconds" from the well known on-line supplier and that included free
delivery.

I bought enough to cover 65m Sq which was about £500 all in IIRC.