On Fri, 19 Aug 2005 22:33:30 +0100, a particular chimpanzee named Andy
Hall randomly hit the keyboard and produced:

You could try contacting building control at your local authority.
They will have been involved in the building to check compliance with
Building Regulations. You can look up the relevant ones on
www.odpm.gov.uk and then part L1 which has to do with energy saving.

Not necessarily. It could have been overseen by the NHBC's Building
Control. If so, the OP is stuffed, as they are in the pockets of the
major housebuilders (although as I've never heard of Twigdens, there
may be a prayer).
--
Hugo Nebula
"If no-one on the internet wants a piece of this,
just how far from the pack have you strayed?"