We only managed to get F on the way out as for some reason they were avail to book direct (maybe a cancellation) - I never saw F appear at all on the return, so we’re flying back J at the moment (can’t complain really). I had to ring at 1am to get the return J seats (F wasn’t even released or I missed it) and by the time the agent secured our 2 the other 2 avail had gone.