Nice little Youtube channel of someone who cycles in to Edinburgh with a camera on their head -sometimes they film the drive for comparison. The footage is all a bit dark -if you are wondering why there are so many cars driving around in darkness, that's scottish winters for you; the films are probably taken at 08:45 in December with daylight some months off.
Best video is this one
It is either an argument in favour of helmets, or in praise of maintaining some distance between you and the vehicle in front, especially if the vehicle in front is bus. Remember: whoever crashes into the back of someone else is viewed as liable.
It's interesting that there so many buses in these videos: a reminder that there are some cities in the country the same size as Bristol which have a functional bus service. They're getting a tram line too.