In message , Tim Lamb writes
Sadly the friendly Building Inspector has moved to another authority.
I did pick up a few points during a long chat with an architect....
It is possible that remedial action at one location could cause problems elsewhere; if the rest of the building is also on the move but more slowly. This could probably be identified with a couple of test pits.
Also, Insulating the floors is not going to impact hugely on thermal losses. With my usual aversion to sums, I have not actually done any calculations. He said that with only 25mm of PIR insulation in the walls (lath and plaster, 4" studwork, render, 25mm PIR, feather edge or more render) and relatively large old spacing DG windows, a carpeted solid floor is not going to be the biggest loss. I really must do the sums!