Actually, unless the rules have changed in the last 2 months or so (quite possible with the CAA!) the old UK CAA conversion rules still apply if you have heavy jet command time. This means an ICAO ATPL holder who has more than 1500 hours in command on a heavy jet (I forget the actual weight limit, but it's effectively 737-size and upwards) and total time of 5000 hours or more, will only have to do Air Law and Human Factors and pass the initial IF flight test to be issued with a UK (not JAA)ATPL.