On 26 May, 13:56, "whisky-dave" wrote:

So does this saving sound reasonable

No.

Can't imagine any scenario in which case LPG would work out cheaper.
If you have mains gas available and already installed, it's cheap to
supply it. Connection can sometimes be prohibitive (£20k quote for my
parents, and that was only 100 yards) but supply afterwards is cheap.

There are also regulatory issues about piping, i.e. some CORGI wanting
a sizable bone to re-plumb the lot.