INNflight
If you came to UK with a fresh new FAA CPL Multi IR you would need to;
(LASORS D1.5)
1. Complete the JAR-ATPL ground school course & pass all 14 exams
2. Complete CPL training as required by a JAR FTO and pass a JAR-CPL flight test.
3. Complete IR training as required by a JAR FTO(min 15hrs of which 10 hrs FNPTII and 5 hs A/C) and pass a JAR-IR flight test
Once again 1 & 2 can be achieved in the USA but 3 must be done in the UK or another JAR country.