While we knew the Dell Streak was due to arrive in the UK on June 4th, until now we've not known exactly how much the Android MID will be. Happily UK retailer The Carphone Warehouse has stepped up with some figures, confirming that the Streak will be available on carrier O2 from free with a new contract.
That's assuming you're willing to commit for £25 per month (or £35 per month with unlimited data). If you're more interested in buying SIM-free, the Streak will be £429 - the price of an entry-level iPad WiFi + 3G, incidentally. It's worth noting that, while the iPad 3G has 3G access for the US and Europe, the Streak will only have European 3G.