In case you missed it, the BBC's Inside Out East programme on bad professional drivers, screened last night, is available on iPlayer for the next month.
The programme showcases how cyclists and drivers are using action cameras to catch professional drivers who drive badly.
Presenter David Whiteley meets Dave Sherry, a cyclist and bus driver from Harlow, who posts footage on YouTube of lorry, van and bus drivers whom he believes are driving irresponsibly.
Sherry's clips frequently come to the attention of drivers' employers who are rarely happy to have their name associated with poor driving.
In 2013, Sherry's footage of a bus driver using a mobile phone led to the driver being sacked.
Sherry also sends the worst examples to the police.
Asked by the presenter if what he does isn't vigilantism, Sherry points out that he doesn't take the law into his own hands. "I just report it, but I'm very effective in the way I report it," he says.
How effective? He claims his footage has resulted in around 50 convictions, which probably makes him the most effective citizen traffic cop in the UK.
Our official grumpy Northerner, John has been riding bikes for over 30 years since discovering as an uncoordinated teen that a sport could be fun if it didn't require you to catch a ball or get in the way of a hulking prop forward.
Road touring was followed by mountain biking and a career racing in the mud that was as brief as it was unsuccessful.
Somewhere along the line came the discovery that he could string a few words together, followed by the even more remarkable discovery that people were mug enough to pay for this rather than expecting him to do an honest day's work. He's pretty certain he's worked for even more bike publications than Mat Brett.
The inevitable 30-something MAMIL transition saw him shift to skinny tyres and these days he lives in Cambridge where the lack of hills is more than made up for by the headwinds.