DfT – It might seem difficult but after you have done it once, it is very easy and the DfT are very efficient.
I currently charge £20/hour (Hobbs) at Breighton, and know of an American fella in Cambs who will instruct for free. So that's at least 2 of us to help swing things in the favour of people who don't want to be ripped off.
I wish I could find someone like you.
The going rate for FAA instructors seems to be £75 or €100 for an hour which, compared to the usual club rate, is extortionate. But, as already said, some instructors want to charge for a whole day at anywhere between £350 and €600.
It is difficult to find someone who will undertake a BFR properly (I have heard stories of people not passing their BFR which is not how I understood it should work) since some of the established schools with FAA instructors have stopped offering this service or have ceased trading. So the charges seem to be just a question of economics – increasing cost of an increasingly rare resource.
If nothing changes in EASA world, I do not see much of a demand for FAA training in Europe. The only thing we will need an FAA instructor for is going to be the BFR and the odd extra rating. So maybe the FAA instructor will be come more scarce?