After 30 June 2002 it will be impossible to unfreeze your CAA frozen ATPL using the CAA criteria i.e. 1500 hrs of which 100 night (in simple terms). You will then be subject to the JAA criteria i.e. 1500 hrs of which 500 multi-crew (I think). You will not, however, lose your exam credits since a valid IR keeps them going for 7 years so in effect you can keep renewing your IR until you land an airline job then accrue 500 hrs mutli-crew and Bob's your uncle. Alternatively , like me you can scramble for those 100 night hours and unfreeze before then to get a BRITISH ATPL and F@*£ JAA FOREVER! B*&^%&DS!. .(You may guess I'm not keen on JAR).