Hmm I've been stopped once - In my new car on the way back thru Longsight (not a great area of Manchester) from the movies at midnight. They were pulling over all the cars on the road for a random insurance check.
Conversation went:
P: 'Is this your car sir?'
Me: 'Yes, I've just bought it'
P; 'Where have you come from sir'
Me 'Just on my way back from the movies, I live at [gives address]'
P: 'Do you know the registration number?'
Me ' No, it's a new car and I'm afraid I can't remember it'
P; 'Is it insured?'
Me 'Yes officer.
[looks for car tax holder given out free by insurance company], by e-sure'
P: 'Do you have a licence on you sir'
Me : 'No, it's at home' [
in the UK carrying your driving licence isn;t compulsory but poice can put you on a 3 day 'producer' if you don't have it;]
P; 'Do you mind staying here while we ring in an registration number check?'
'Me 'Not at all'.
P: 'What do you do for a living sir?'
Me' I'm a Solicitor, officer'
P; Looks at me, looks at the car in front who his partner has stopped and which appears to have no insurance and a young man inside.
'It doesn't matter. On you way, sir. Have a good evening..'
Having driven around Manchester late at night (I used to go out clubbing 3 times/week and didn't drink when out) for 15 years that is the only time I have ever been stopped.
I have been stopped once only at customs too and as he started unpacking my bags he asked me what I did. When I told him he said it didn;t matter and waived me through.
I am sure that if I was a young black man driving a flashy car I would have been stopped more than once every 15 years.
Now part of it is because I don't drive a flashy car but most of it is because I'm not black.
The reason they don't even bother to go through the motions with me is firstly me job, but probably as importantly, my impeccable middle class accent.
To those outside the UK it is hard to understand how much accent still reflects your class and level of education - I was born in Sunderland in the North-East for example, but listening to my accent you couldn't place me within 200 miles of the place.
It is used as a shorthand throughout social interactions and when it comes to instant judgments about someone in the UK is still much more important than the colour of their skin (assuming you can hear them).