There's Nothing like heating the earths crust eh?That's very interesting ,having just read up on it.
So if you wanted to. you could remove doors and skirtings lay GSHP heating pipes on a non insulated floor , pump in 60mm covering then fit new skirting and cut the tops & bottoms of the doors to get them to fit the slightkly smaller frames instead of having to chop out the floors and put in a deep thermal floor .
Perhaps even being able to do the same on broken screeded floors , "Like wot we ave ere ". or pop & remove the screed and do the same .