I've just read through the thread, and watched the video of the Tamiya M03 Rally at Kidderminster.
Worth mentioning, at LORMCC club events, we use (just one as it's a pain to put down and take up between heats) a small jump. We're (regular Mini racers) all in agreement, that this add's a HUGE fun factor to the races. We intend to use this, and other Jumps/Washboards/nastily place pot dots and anything else we think of, at the Mini GP