I must say, I used to frequently get J to F upgrades but haven’t now for two years or so. I think they have got so good at selling these that free op ups are now far less frequent. No complaints: they are squeezing more ££ out of flights than before. I do consciously use BA less for long haul now and use a variety of other OW carriers as the reasonable frequency of upgrades used to keep me loyal but in the absence of that incentive, I prefer to diversify