[Graham]

I'm getting a bit confused here Graham.

There's cars listed in two different events. 
Ninco cars not allowed in the Ninco class.
Under 3 litre cars in the over 3 litre class.

I'm finding I'm going down the list to see what I might have then double checking on Google to make sure I'm looking at the right cars and not making much headway.
The Rover is more work than I really want to do.

There's already a width limit across the tyre walls, wouldn't it be far less confusing to stick to that? Together with a maximum body width for event 2?

Ok been a busy day, but to answer your question. My main aim is to have 3 Events with different cars in each, with maybe one or 2 exceptions.
Basically
I have intentionally designed Event 1 biased for small saloons and Mini "narrow" cars. 
And obviously Event 3 is designed for quite the opposite for any large saloon "wide cars" Like some early BTCC, DTM and some other Silhoette Saloons.

So Event 2 is meant to be for cars which are "inbetween". Conveniently most of the "Super & Modern" Touring cars  fall into this group. Mostly Scalextric & SCX based and a few Nincos fall into this group (probably no Carrera's, so I might as well drop them, but I am not very familiar with Carrera brand cars) So it is on this basis that I have chosen the cars for each group.

I will clear up the anomolies in the heading titles, as I can see that as the proxy ideas have evolved, some things have not been updated.