regarding work in canada, visit
www.canada.org.uk
it will tell you all about who is eligible to go there. there is a self-assessment form from which you can gauge your eligibility to live and work in canada. you basically need 70 points on their scale and I would estimate from the form that most UK atcos willing to give it a go would easily pass the 70 point mark. (assuming NavCanada offers you a posting).
by the way...
the Irishman in Vancouver has successfully validated, is having a great time and reckons he's much better off overall than if he'd stayed in the UK.