I do wonder how good the data GPs have on people's weight is though?
I've never been weighed when registering, I did once get weighed, and I was probably a pretty high BMI, given I was about 30kg's heavier than I am now, but I doubt that got carried forward anywhere to other GP's since then.
However, I suspect most people who have had a high BMI for some considerable time would be known to their doctors, as it is hard to not have other health issues with a BMI over 40, and if not, maybe this will encourage them to talk to their GP.
I would be interested in some stats differences on how many people have entered BMI 40+ since lockdown begun through the much more inactive lifestyles and how many have been motivated to lose weight, it could be that the group is completely different to a year ago.