If you achieve 2000 hours total time on military aeroplanes, of which 1000 are as PIC and 500 as PIC/US, and are a graduate of a ME OCU on an approved type, then all you will need for an ATPL is to pass the Air Law exam, have the CAA observe your Instrument Rating Test and obtain a JAA Class 1 Medical. Fill out the form, pay the dosh....and a few weeks later the little green book pops through your letter box.
But you have to get there first - and that'll take around 10 years after you finish your ME OCU.