I am looking for a plastic kit of HMS Cavalier ... any suggestions?

HMS Cavalier is a Ca class destroyer however as far as I’ve been able to find no one does a kit of a Ca class in any scale, media or fit.

Take it you’ve been to Chatham?

Actually, I haven't seen the ship at Chatham, but am aware that is there. In fact, I've been asked by a friend to build a model of the ship for his private collection. Unfortunately (as you confirm), there appears to be no kit available in any scale ... and the prospect of scratch-building isn't on my agenda!
He has also asked me to tackle HMS Belfast (available in the Airfix 1/600 range), and HMS Roberts (from the Trumpeter 1/350 range). Maybe HMS Cavalier will be released at some point in the future.