Although things are re-opening now, I think the shut down in central london was more than you are saying.
I live in central london on a main road and traffic has been really low (relatively) for the last year. Normally even at 4am in the morning there is queueing traffic outside constantly, but even now at 10pm up to 10 minutes might go by without a car. It is a very clear reduction.
I do not believe that you could ride through London in April of this year or last year without seeing a mask. Right now maybe - back last march when the government said we shouldn't wear them maybe.
Things are re-opening now, but during the major lockdowns behaviur changed a lot. I say changed not stopped.
People were allowed out of the house to excersise, so any easy excersise routes (parks, paths, nice walkable streets) have a lot more foot traffic than normal. There is a canal near my home where typically outside commute hours people rarely pass - during deep lockdown it had foot traffic like a commuter station with people queuing to walk down it. But this is a sign of 'lock down' - it is people doing the only behaviur they are allowed to do outside their house.
In terms of open shops during major lockdown - I noticed that in Soho, people would gather with supermarket beers outside the closed nightclubs and street drink together. In fancier areas of town, I saw wine bars selling mulled wine covertly through a crack in the door - looking both ways up and down the street like a naughty school kid selling weed. But again these are changed behaviures that show that the normal version is banned. But I didn't see ice cream shops. Maybe now?
There was a huge uptick in the number of undeground raves - and I also heard this happened in manchester. There were several raves in the mile around my home and we'd find out about them when the police turned up in numbers. These were "break into a shut down shop and turn it into a club" events with hundreds of young partiers, not 8 people turning up for grannies birthday.