(obviously talking UK here, where masks haven't been compulsory in months).
I live in a part of Scotland where mask compliance was very high. Whatever people's personal thoughts on masks and whether they were effective, people wore them because it was illegal not to. It was exceptionally unusual to see someone unmasked in the supermarket this time last year, even after England ditched the masks and we continued, compliance was 95% or more.
Have just been to the local small supermarket, there was about 10 customers in, 5 in masks. And a masked member of staff.
And before everyone piles in with "oh they might be clinically vulnerable" well yes they might, but masks are supposed to protect me from them, and pre March 2020 I never saw one single mask, ever. Except in a hospital.3