You may be right with the 8' width, without going out and measuring some.
Thing is the planners and supermarkets might say their car space sizes meet the current regulation - the problem is the regulations were set in the days of the Austin 7
The thing is car parks are a source of easy money - they want to cram as many in as possible. Then they can try and "fine" you if you overstay your time. You pay for 3 hours but only stay for 2 - so they make an hours money on your space, when another car slots in when you go
In the old days you could pass your ticket on.
It's going to be fun with EVs - 4 hours to charge the batteries - in a car park where you'll get "fined" for staying over 3 hours
Which way do you park in the space ? front in or front out. If you reverse in then some clown will drive in behind you, right up to your bumper. There's precious little room to push a trolley of shopping round to your rear hatch door
Best to drive into the space I think, as 99.9% of drivers can't reverse, or at least manage it 2 or 3 hours
I like the American herring bone pattern parking - policed with guns.
I'm guessing their spaces are bigger than ours ?
Anyone over there got a tape measure
Not just parking spaces, look at the garages they build on these new housing estates.
You can get the car in - but no room to open the doors
You have to climb out through the rear hatch (if you have one).
This is why garages are used as fancy sheds and the cars are parked in the street.
Age does make things appear smaller.
The hill outside our house seemed quite steep to us kids when we went tobogganing.
Nowadays it just seems like a gentle slope.