There are several threads you should find easily on converting an ICAO CPL to a UK / JAR CPL (JAR = European) which should answer most of your questions. He can expect however considerable classroom time and some examinations, plus some flying training and a skill test.
Regarding a job for a 250hr foreign CPL in Britain; the chances are extremely poor. The country is full of British CPL/fATPLs with similar qualifications and experience who are job hunting.
If flying training in the Phillipines is of high quality and inexpensive, his best bet might be to set up some competition to those already organising PPL training in the USA and South Africa. That might be quite lucrative and presumably he has all the contacts to do so.
G