There are several ways of crossing Airways. I would expect that for these flights the corridor that is set up for such crossings will be activated (I think its FL230/FL240 but someone will correct if not) which is located near or even through WCO. The corridor will block these levels from civil use and the a/c can use it without civil/military co-ordination. The other way is that the military team working at Swanwick (LJAO) who control such military flights through CAS may assume control just for the crossing. The handoff to 133.9 will definately take place after the a/c have crossed all the north/south airways, know to many as "the Alpha's".