Colin Rosenstiel ) gurgled happily, sounding much like
they were saying :

However, any vehicle that can't see if it safe to turn left without
injuring someone on its nearside should be banned from the roads. If it
was a railway vehicle it would be as unsafe. Two Cambridge cyclists have
been killed in the last year because of such unsafe vehicles.

It's quite straightforward. The vehicle isn't to blame. One of the road
users is.

If the bus started to overtake the cyclist then turned left, the bus driver
is to blame.
If the cyclists started to undertake the bus about to turn left, the
cyclists are to blame.