Will rebuild the inner brick wall in the rear bedroom and pull up the floorboards in the room with bicycle to clean it out and inspect the joists ... will take a few photos ... probably will insulate the pipes, check the air bricks from proper flow through the underfloor area, remove any debris and replace any rotten joists.
Should be fun
These Brits man, don't really build stuff like the continentals or the Americans. Totally different systems, ideas and craftsmanship

However, much cheaper for labour and materials (if you wanna go cheap that is.)