These days the police in the UK are really cracking down on people doing "improper" things in cars. There's a "catch-all" offence called "driving without due care and attention" that's used for such things, and people have been prosecuted for things as minor as drinking from water bottles while driving. The penalty is between 3 and 9 "points" on your licence (you get a driving ban if you get a total of 12 points), and a fine of up to £5000.
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