Thought I'd look around to see if there was anything between the £70 one I bought and the Dewalt. Turned up this one which is B&Q's own house brand:

http://www.diy.com/bq/product/product.jhtml?PRODID=87378&CATID=62428

Surprise, surprise it is identical to my Clarke one. Obviously the output from some OEM in Taiwan or China.
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Remind me to change my signature to something more interesting someday