With the current regulations on Ch plates your car has to get a current rwc.

That means no cage or other mods without VASS certificate. You can't get a VASS for a 6 point cage anymore as far as I'm aware, you may be able to get a half cage approved if you have your car registered as a 2 seater.

This only applies for new applications if you applied before the rule changes you didn't need a rwc only scrutineers by your respective club.

It's going to cost you to get it all official now.