Coffeeking, your premise is incorrect. The cyclist was going straight over, and as such, would have been misleading to give either a right hand indiction, or to signal left until passing the first (left hand) junction from which the car emerged. He was also in the centre of his lane, and so did nothing wrong.
The idea you should slow down, whether in a car bike or motorbike at every priority you have just in case you have not been seen is unworkable in practice, or london will slow to an even slwoer crawl that it is already.
And as for the idea he should have been going slower and would have avoided the accident, is a step beyond "defensive driving". Indeed last week, in the clear right hand lane, a car pulled out from staitonary, in the left hand lane, over 30 yards from red traffic lights. I was on a motorbike, and he did so so quickly, I didn't have time to react. I am a poor motorcycle rider, ie I can't "ride well" (ie cornering speeds, ect) but am very safety consious, as I work in a personal injury cliams dept for directline. I have absolute safety in mind, and am more cautious and observant than frankly 90% of other bikers I see. I do ride "assertively" though ie to be seen, but don't undertake, or ride agressively, nor generally break speed limits. But I could not have avoided the accident I had. The early warning signs of say seeing the front wheels turn- well it happened too quickly.
