Have been looking for something along these lines for a couple of days, independents, Halfords, Tesco etc. This one beats them all on price by miles and if you check the reviews they are pretty good too.
I'm sure they aren't the best on the planet but my two grow 6" a week so this'll do for me :) Link is to Girls Bike, there's a boys one at same price.
I'm not sure it's a deal as such (there's no evidence of a price reduction) but there's next to nowt on HUKD for kids bikes so I thought worthy of mention. I don't mind if it's cold, I'm happy, I've put hot deals on here and nobody gave me any rep at all. How cruel. Life just isn't fair ;)
Hope this helps somebody out there :)