Flying from the same area as MG the stupidity of the whole charging system is that while a small airfield may no longer be charged, a small flying school who maybe have one flight a day with no permanent staff will have to pay the full whack 😕 It seems that no amount of discussion with NATS has been able to get them see sense.
If you can't get a 'free' account MG then Rocket Route or EuroFPL or SkyDemon would be a good selection to consider.