I'm back to report that after yet another review I've been given the Avios and TPs for the "P" ticket from last October. It's showing in my statement as "Class: Business (J)".

So please all go and try again. My suggestion would be to call (I know it's extremely time consuming) rather than submit a new claim online.

I guess the moral of the story is that if we all push collectively, FT can be very powerful.