HELP PLEASE!!!

Been looking at couple of Group N Escort Cosworth rally cars / shells with the intention to use as a track car.
The problem is the cars I have looked at are not showing Ford RS ESCORT COSWORTH on the V5 log book - is this normal?
They show something like Escort CL with Cosworth showing on the engine number section.
Both are deffinatly Cosworth shells with the extra length.
Could anyone shed any light on this for me & anything else to be aware of.

Cheers

Pete