I don't think your q is really answerable OP in the way you would like.
When there are a very low number of cases you can track and trace them and get the kind of precise info you are wanting about when and where people got it
This is how things were supposed to play out. It was accepted there would be outbreaks but they'd be traced and locked down.
I think it's safe to say we are now in an exponential spread situation again in many areas with cases rising very rapidly and so many people have it that it is not possible for many to figure out where they got it and therefore to say what is the most risky.
If you look at the hotspot graph upthread no age groups are really disproportionate it's just rising for all age groups now. Maybe it started with unis and schools but it's escaped and is far beyond that now and it's doubtful the current strategy will succeed in putting it back in the box. You can't just stop over 60s getting it. The more there is around the more at risk they are as well as everyone else.
Things we have found out are that indoors is riskier than outdoors and that the longer and closer the contact the higher the risk will be. Masks and handwashing and sanitising help a bit but aren't a panacea especially with the way most people use them so poorly.
It is likely that most spread is happening in gatherings in people's homes because that is where you are most likely to relax, spend more time, not distance, hand wash etc and have limited space and ventilation and less cleaning than in an office or restaurant.
If you are highly motivated to avoid getting it you will limit your social contacts overall, don't meet people with lots of contacts like kids, meet outside ideally and don't violate distancing.
But it's easier said than done.
I think Boris is going to have to go for a National lockdown again before too long probably after other countries eg France have done it.