TB is right, U may qualify for some exemptions, depending on your hours & a/c type. 500 hours on multipilot a/c is the magic number. But IN ANY CASE, I'm afraid U will have to pass the 14 JAR examinations. The exemptions only concern the (ground & flight) training, not the examinations or flight tests.
Since the 1st of Feb 2001, an ICAO IR cannot B converted into a JAR IR anymore. U need the full approved course of 55 hours. It is, however, still possible to convert an ICAO CPL into a JAR CPL, the amount of training being "at the discretion of the FTO", so 5 to 10h if U're good, a lot more if U're ... not as good.
MF