You might find this interesting -
IN THE COUNTY IN THE LAST WEEK THERE WERE:
10 serious, 52 slight injury collisions and 142 damage only collisions.
21 drivers were arrested for drink-drive offences, 7 at the scene of a collision. 2 drivers were arrested for driving whilst under the influence of drugs.
Drivers prosecuted for offences:
No waiting 13
Excess speed 11
No seat belt (driver) 9
Using mobile phone whilst driving 8
Parking on offside at night 6
Contravening red traffic light 5
Unnecessary obstruction 3
From this site:
http://motors.cambridge-news.co.uk/news/motori ngmatters/article.aspx?aid=68038
So it does get enforced.