Question Author
Update...
OK, it appears to be a rather farcical turn out.
Very briefly, someone in his block reported 'suspicious behaviour' because said son couldn't sleep, and was out in his little shed cleaning up some old, but good quality tools he picked up at a car boot sale.
Monkey wrench, Yankee screwdriver, that sort of thing.
Well, off they went to Asda, and were picked up less than a hundred yards up the road.
Where are you going at 3am?
Asda
What for?
Cat litter.
Why didn't you go during the day?
I prefer shopping at night when it's quiet.
Then they searched him.
Why are you carrying a torch?
Because it's 3am and dark.
and so on, and so on.
All perfectly true answers, I guess they thought he was trying to pull a fast one. Part 2 in a moment.