I did my PPL, night, Radio licence, hr building, MEP, and a FAA IR in USA. I then went to Stapleford to do the CPL and IR reduced conversion courses (both JAR CPL and IR courses were reduced base on having an ICAO IR). I then went to Oxford to do the MCC, and within 2 weeks of having done the MCC - I passed the interview with RYR. These days, I don't think it matters too much where you did the training. The blue book with the correct ratings is all you need- as it should be!
(highly recommend SFC btw)