I've now figured out what is going on. The £2k Aero Package has the 18" wheels, boot lip spolier and a very nice complete uprated front bumper. The new free offer has 17" wheels, boot lip spolier, rear skirt, side skirts and front skirt added on to the existing front bumper.
Lexus Woodford called me back today and offered me all options, even though the kits and offers are supposed to be taken up at time of order. Although I like the expensive new front bumper on the £2k Aero Package , I have decided to go with the offer, plus the 18" wheels and this saves a grand or so. The down side is that I can only have one offer, so the free servicing had to go.
I saw the black IS200 in the Woodford showroom when I ordered 2.5 weeks ago and it looked kind of nice, but definately needed bigger wheels.