I went past Kerridges today, there didnt seem to be many TVR's about the showroom had some BMW's in it, I could only see about five TVR's, maybe they were hidden around the back. It may be worth phoning them before you go out of your way.
You could drop into Offord Motors (near Cambridge) on your way home. 01480 811484. They have a small showroom and are quite well clued up on Cerbs I think.