Have decided to offer the car at £7,950 without the additional set of wheels and without the other three spare tyres (see http://photobucket.com/clk55). For the full package, add £300, making the price £8,250.
This if for anyone who wants the car for regular or weekend use without going near a track. I'll then try and sell the wheels and tyres separately.
Update: the CLK is now back on its normal '03' plate and I have the updated V5C and MOT certificate, so good to go.
I took it to my local weighbridge today and it tipped the scales at just 1560kg with half a tank of fuel. Parkers website says the std weight is 1715kg so assuming the claimed +20bhp from the remap (and as I hit 172 two-up at Bruntingthorpe I tend to believe it) that's 248bhp/ton compared to 214 bhp/ton for the standard car, or to put it another way, 16% better 8)