Additional info:

The £300 price includes P&P.
I'll be including a spare bit of stainless steel tubing (3mm wall thickness) that is the same length as the current drum that would make a good spare should a replacement drum ever have to be made.
The current setup weight is 12.4kg. I ran the machine on two packs of 9.6V Nimhs; if you plan to do the same, the robot will probably be overweight with the addition of speed controllers, relays etc and the easiest way to lose this weight is to remove one of the Speed 900 weapon motors (alternatively lithium batteries are an option).
Now I've had it run fine with just one motor (all the way through Rebel Robots and the '09 Champs) so the second could be used as a spare, or if purchased with just the one Speed 900 motor, it would be £275 for everything.

That is all