[Gpa113]

Good suggestions Graham, 

I have experience of both the SCX and Ninco off road tracks, and have found the Ninco track easier to get all types of vehicles running on.

The difference in the length of the drop arms makes a huge difference when trying to overcome the various ramps and other obstacles. 
So a class by class system should be just the answer.  The SCX, Avant  etc type of models can get round the most amazing circuits,  but the Ninco cars just can't do the biggest obstacles.   

As for the Scratchbuilt class.......My Fiesta will go round a Ninco track,  with the clip in obstacles all day long, but on a full SCX track it will be well out of its comfort zone.  But then again, why the two young  lads driving it have decided that a Ford Fiesta XR2i is a suitable off road conversion is probably more of an issue....   

Looking forward to the contestants reaching  Surrey next month, and my chance to put them through their paces.
Pip