Why not consider the best of both worlds?
Consider the USA and training at a UK approved ATO for the FAA licence (PPL, IR, Multi, CPL) with UK or European instructors thereby ensuring the conversion using the Bilateral Agreement will be simple easy and less expensive because you will have reached the required standard. My best estimation, you could complete the whole thing (zero-CPL/ME/IR) for 65% of the cost in the UK (depending on which school you chose of course).
Trying to be impartial here, why not look closer all of the schools which have FAA and UK CAA and EASA approval?, not in any particular order;
L3
Skyborne
Pilots Paradise (now Wings Airline Academy)
2-Fly