[Graham]

That's the problem I found before with the Road race, but we actually had 63 cars, so buying a very large box meant buying 10 or more very large boxes which was very expensive.
But now we are looking at maximum of 40 cars might be easier to find something suitable as a one off. I like the idea of the soft foam insert, but again 40 cars need a lot less space to meet the transport box size limitation