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If Molesey is within casting distance for you, try Molesey Refrigeration Centre -- the name notwithstanding, they do all sorts of appliances. They sold us most of what currently resides in our kitchen -- which is likely higher-end than you're after (in particular our cooker is a double-oven-and-six-rings job) -- but they did have smaller/cheaper stuff as well as far as I remember. www.mrcentre.co.uk is their site.

You may wind up needing a wok rest rather than a wok burner, I fear.