SLF
You might have a look at Sherburn in ELmet before making your mind up.
LBA - you learn at a controlled airfield, with excellent r/t required ... no worries about going to a larger field when you have your PPL.
Sherburn - you learn on short grass runways, learn to handle the a/c in a tight circuit.
Pros and cons, but have a look anyway.
Can't comment on the schools you mention at LBA (haven't lived in the area for years), but the course fees look realistic (maybe a little low)
Best of luck with the PPL.