Granted it won't be a JAA PPL, but you can still fly here just fine on an ICAO PPL with no restrictions providing you stay within the UK.
Not quite true about no restrictions from what I understand - SA licence is
type specific, so if you learn on a C150 then want to fly on a PA28 or something else then you need to be signed off for it by a SA approved instructor (I believe Irv Lee can do this).