You may recall that I sent a Hornby chassis for a match race with Clive a while back. This one started out like the yellow one in Dave's 1st photo.
The motor was swapped for a 2.5 ohm can motor from an online vendor. Stock braids were replaced with copper and connected directly to the motor. Better tires and a wheelie bar were installed. In testing for a recent event it ran .566 powered by 20v.