is very relevant here - the thing about "close passes" is they're not dangerous in the same perfect world where everybody passes with plenty of room, but in the real world, just as many people don't pass as shown in the highway code, so there are many reasons to pass like in the highway code:
* road surface problems could cause a rider to fall, or affect course even if they don't swerve
* winds (incidentally BBC weather forecast that day was 25-30mph winds, hail & rain - see shoestring's other videos for what the weather was throwing at him on that ride)
* Front wheel puncture, or anything getting caught in chain or wheel
* Even a simple shoulder-check as the vehicle approaches that close can be enough to cause the rider to be hit, and that's all assuming perfect driving from the vehicle overtaking (of course if they were a good driver they'd have anticipated and given plenty of time and space to allow for these things)
Essentially a close pass is only "not dangerous" assuming both driver and rider have no problems, hold almost perfectly to their respective paths (within a tolerence of just a few inches, at 60/25 mph) and there are no problems with road surface, bike, car or weather.