A massive difference between the UK and placed that have high levels of cycling infrastructure implemented (Netherlands, Denmark, etc) is the average size of supermarkets.
Suburban UK relies mostly on vast out-of-town massive supermarkets, whereas in my travels round the aforementioned countries all I’ve ever seen are much, much smaller places – similar in size to a typical local Co-Op, or maybe a Lidl/ALDI as a push but that’s it. There definitely don’t seem to be the massive retail parks either, everything is more integrated. You’d need to fix that via planning restrictions to even have a hope of getting people out of cars (which, tbh, I don’t see happening).
As an aside, there’s an interesting study which shows a strong correlation between supermarket size and obesity levels: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4511521/
To quote:
“From our data, it is clear that the lowest store size and obesity rates were from the three northern European countries sampled. These countries have high urban population density combined with infrastructure that encourages shopping trips by foot, by bicycle or by public transport rather than by car [10]. As a result, shopping trips in these countries may be more frequent, involve active transport and the carrying of groceries, and be more likely to include the purchasing of fresh, perishable foods. As such, large supermarkets may be a useful marker for a cultural and social pattern of shopping and consumption that promotes obesity [11].”