Thanks for the response alex, but I found a decent selection on cellpacksolutions.com, I got some 169mm, 67mm and 42mm flat width heat wrap 0.15mm thick

What i am still looking for, second hand preferably:

1)connectors for the battery, removeable link, charge port etc.
2)A Nimh charger that can do 10 cell packs 12V
3)4 (and maybe a few spare) M5 counter sunk headed bolts 15mm in length for the chassis.
4)I am using the UK robotics drill mod, if anyone has any better wheels or wider wheels ~80mm diameter up to 35mm wide
5)A spektrum dsm2 RX
6)The battery bars for connecting cells in home made packs

Also does anyone know the size of the holes are and spacing on the XXL speed controller?

I am looking at trying to get a simple wedge running at Barnsley Event if the XXL speed controller arrives in time.