When I was 19 I got an Astra MK2 - Red - special edition faded red.
Got stopped three or four times, it was my first car after passing my test - driving around Norfolk at 3am with mates mostly. Just got breathalysed loads.
Got a nice Ming Blue A4 1.8 at 21. Got stopped in Norwich and fined for mis-spaced number plate by a really really really miserable copper who asked if it was my dad's car, I was 21 at the time, he also took a polaroid and reported my plate to the DVLA
About a month later got done over by a traffic car whilst doing three figures on the A14/A11 in Suffolk at 5am. He had followed me for 15 miles. Painful - very painful - very very painful. Veeeery sore licence afterwards. Copper was a nice chap though, very polite and friendly.
A3 1.8T - never been stopped in 9 years.
S3 - not been stopped in 6 months.
<rant>TBH Now I've lived in Thames Valley for 7 years, I'm not sure Thames Valley Police do very much. I've never been stopped, and the interactions I've had with the police and I've heard of from other people lead me to believe they are a bunch of incompetent, lazy, poorly trained muppets. Which is a shame to tar them with that brush as I have a lot of respect for the police generally.
They seem to have a complete inability to properly investigate or deal with a crime. I live in hope to be proven wrong and have some positive interactions with TVP.</rant>