Best bet is to move country and start in a coffee shop or med clinic or something, Holland would be easiest 'cause UK citizens are allowed to work in the EU without a visa for about 6 months maybe more (if your seriously considering it research!). Other than that your next best bet is to wait till the Lib dems get in and they (according to their manifesto that got slammed by the conservatives last year) are planning on going as far as legalizing and regulating it.
And no matter how experienced you are, you've earned your experience, effectively illegally so wherever you go you'll have to start at the bottom and work up, so you'll be on minimum wage and then go up etc as with most business.