Serco do ATC at Wattisham and Middle Wallop. The money is good, and I know that at Wattisham, when the army go on holiday, so does ATC, so the time off is pretty good. As to recruiting, I don't know about current vacancies, but it's always worth registering your interest if that's what you really want.
I've know idea where you work now, but if you're bored with civil op's, the military airfields offer no more variation, in fact Wattisham and Middle Wallop are less exciting than grass growing or paint drying.
Why not try a regional airport, where you get to "mix it" properly? or is that too scary for you to contemplate...?