Yes, a couple in the media recently. One in particular sticks out as she was exceeding her driving authority at the time, so rightly got stiffed over it.
But that aside they're held to the same legal standard as the every day motorists, which is odd to say the least considering their training and exemptions. Trained to do all sorts of stuff but when they do it and it goes wrong, even if the bobby themselves was following their training to the letter, they face being measured against the same legal standard of below or seriously below that of a careful and competent driver. What careful and competent driver would be pursuing someone or doing 140 on the motorway in the first place?
There were steps afoot to change the law to recognise this, but not following politics or giving a sheet what politicians get up to I don't know where it went.
When Ipin RPU I used my own judgement - "I'm not risking my my licence or liberty for that sheet" would often go through my mind and would drive normally. The inspector hated it when us older hands did that, but it's our licences and we can't be ordered otherwise.
In the end I quit RPU over it and was moved to a community team as a punishment posting (strange punishment, because I loved it there and never working nights was joyful) but that's a tale for another day.
When people tell you RPU is a glamour job or an elite posting they're talking out their behinds. It hasn't been since maybe the 70s at the latest, and getting enough candidates who want to do it these days can be tricky as they all want to go into CID because they've all got degrees and aren't interested in drty front line stuff for a minute longer than they have to.