I saw a youtube channel of a British body builder and strong man champion drive all kinds of vehicles and seeing if he can get through the drive through and car wash. He was far more interested in the different drive throughs than car washes. Definitely a fast food connoisseur. If he didn't spend most of his time lifting weights he would be fucking obese instead of just having a big beer belly.
https://www.youtube.com/watch?v=acnixbMTY6Y
Combine this kind of food with shit weather not many people are getting out and exercising. I am not surprised that as soon a British people started eating food with flavor they got as fat if not fatter than Americans.