In YEG, down to 2 ex-NATS and one ex-RAF in the experienced controller program, plus one ex-NATS from several years ago and one Brit who married a Canuck and started out as an ab-initio here. Also one Kiwi, 3 Aussies, one South African, if I'm counting right (may have to remove socks).
Those who've left in the last year or so... One ex-EGHH, one ex-SERCO Middle East, one ex-Warton, one Aussie, one ex-NATS.