Thanks lads!

actually I don't mind at all if it's the A359 (or will A350-10 be out next year?) haven't been on one before!

I think if i book the 789 and it changes to an air belgium, I'd say they'll give me a free change to JFK on planes with F cabins...

Happened to me this year last month. Booked back in Nov, F both ways (can't remember if it was A or F fare) deliberately had 744s both ways, equipment changed on the way out, and I was furious, but I knew there was nothing I could do.... then magic... BA cancelled my DUB-LHR flight and I got a free change so 744 both ways, crew was glorious both ways, the one outbound was more glorious, I had 5K which was actually a good seat, on the way back i got 1A (I'm not gold and it was empty so asked if I could sit there) I'll be gold for the next trip so hoping to get 1K out on a 744!

I think I'll keep an eye out for A fares ex-dub and use min-connect on ITA to max out my time in london