There is no procedure in the JAR's allowing conversion from any other type II licence issued outside of the JAR countries. You can only convert from Aus/NZ/FAA to the UK CAA LWTR at this stage, and you must have this done by 30MAY2001, when system converts to JAA in UK.
Hot off the press from UK CAA themselves (I enquired of my Aus licence two days ago).
You can get the info from the UK CAA web site also.
Cheers
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When all else fails, read the manual!