Just wondering what the Avios reward flight availability (if at all?) is like on the Club World only service from London City to New York?

Or is this a daft question, since this service seems very specialised?

It's a flight I would like to go on at some point.

Reason I also ask, is that I'm also thinking of applying for a British Airways Premium Plus Amex, and the next (potentially daft, but predictable) question if I could use the companion voucher for this flight?

Finally, should I apply for this card anyway? I use the Amex Platinum charge card for my spending at the moment, converting the membership reward points to Avios.