I really think that he never actually considered CCTV in passing buses and cars capturing the EXACT moment he stopped and took her and hence how quickly they tracked him, unless he wanted to be caught - but given how he tried to cover his tracks with thought out effort, I don't believe he did.
That’s a good point, as far as I’m aware the only cctv that caught the abduction was from passing vehicles. Maybe he was actually very aware this particular area isn’t covered by static cameras. There must be very few places in London where this is the case.