Probably, and I haven't experienced lockdown in the UK, but in the US and Norway, even people being quite careful see more than just their immediate household.
It's been pretty loose in the UK. Even during the strictest lockdown, which only lasted a couple of weeks, you could still go out for exercise, go to shops for "essentials" (the definition was liberal). People went to exercise and just happened to be walking 2 metres away and in the same direction as their friends. Hardly house arrest.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5756541/