On Tue, 19 Nov 2013 21:20:32 +0000, chris French wrote:

Our house is Victorian, with lots of nice Victorian cornices , skirting
etc. a listed building in a conservation area.

Grade 1 or 2? Conservation area is bad enough, listed ...

Bear in mind that you only really need to insulate external walls.
That may mean only one or two walls per room internally. It's still
disruptive but possibly not as bad as you think.

--
Cheers
Dave.