I've been to do and take the food shopping to my elderly parents. Mission more or less accomplished, barring the inevitable odd item missing from the list. I knocked on the door, they retreated to the living room and I deposited the stuff and left.
Anyway, general musings and observations and are in no way scientific:
I'd say road traffic is probably down about 20% at a guess, and pedestrians quite a bit thinner on the ground. However, there were quite a few groups of people about.
I saw at least 4 or 5 buses which had not a sole on board save the driver.
Morrisons was actually pretty quiet. They have signs advising people to keep 1 trolley width apart. I stress I'm generalising, but I'd say that probably 80% of the people from early 20s to about 50 were actually pretty good at observing social distancing. Unfortunately, I'd say a large percentage (perhaps 75%) of those north of 50 (which is my demographic) were poor at observing social distancing. At the tills, there was generally good compliance regarding SD.
One thing I did notice (also last week when early advice was being given for older people in particular to lie low if possible) was that there was a surprising number of people who looked to be in their mid 70s to late 80s who were accompanied by younger people, for the most part their obviously grown up children (in their 50s).
I passed a McDonalds (Farm Road/Granville Road) on the way home, and the drive through was rammed. Anyone who knows Sheffield will know that a few hundred metres further along on Queens Road, there's a huge B&Q. The car park was rammed. Probably people planning a bit of DIY for any lockdown...