That would be £212 to £243. I hope Nintendo won't make it more expensive in Europe as they have with the 3DS. On the topic of price, I wonder how much additional controllers will cost. With the rumoured HD touchscreen they could be very expensive.
Based on the rumors IGN asked a manufacturer how much such controllers would cost to manufacture and the guess was around $25 U.S. Whether its more than $25 to manufacture depends on the capability of the screen and how much internal guts the controller has (enough to decode video or enough for some functions without streaming power from the console). Retail my guess is $80 dollars.