Bought my Nexus one from the US 3 weeks ago, and i got my credit card bill last week and it cost £353 (wasn't exactly sure on exchange rate as bill on net was in dollars) but i have yet to receive the VAT / Import Duty bill from DHL. I am hoping i've got away with but i'm not holding my breathe

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I believe the DHL bill is in the region of £60, which just takes you over the £400 mark. But it is a hell of a lot cheaper than the websites that are listing it for £600.
I did not buy the mains charger though which will add another £20 ish. If you have a usb mains plug which you can plug your own usb cable in (ala Touch HD / ipod chargers etc) you can use the supplied micro usb cable with one of those mains charger, or of course just plug it into your PC and charge it that way.
I am still awaiting the release of a decent dock to sync / charge off my PC.