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To my eyes it looks like they have much less space in which to travel straight ahead.
I don't think that space has changed this at all (but then I'm going from memory of running past it the other day). If all of the riders on Millbank who want to turn South take the diagonal path onto the segregated lane then there will be fewer cyclists held at the lights, so more space for people going straight on.
At peak times there are certainly situations where there are far more cyclists wishing to go straight on down Grosvenor Road than the ASL-box can cope with, and they [those not as far up as the ASL-box] have to contend with vehicles who want to turn left from Millbank onto Vauxhall Bridge, however there's a fair amount of fuckwittery that goes on here (on behalf of both cyclists and motorists). But a lot of this is due to the current design which puts cyclists going straight on in a left hand turn only lane.
When I approach this junction (rarely now but I used to cycle this way every day on my commute) either I can see it is relatively clear and be able to get directly into the ASL (away from the far left hand side) or, if it's busier, I'll filter up the outside (RHS) of the left hand only turn lane to avoid any conflict with vehicles wanting to turn left.
It'd work better if the cycle lane had solid lines where motorists were not allowed to enter and would have to give way to those going straight ahead instead of those forcing their way across the cycle lane to turn left. Better still stagger the lights to allow cyclists to get through then engines.
Cycle lanes with solid lines that cars can turn across don't make sense in terms of the road markings currently in use (and training/experience drivers have had) and have no precedent (that I can think of anyway).
Personally I'm surprised they didn't consider a separate left hand turn only lane (like Parliament St approaching Parliament Sq) with an island between it and the straight on lanes? That way you eliminate all path crossing contention. I guess there's not quite enough space for something like this though, and the bus/cycle lane already being there makes it tricky to make lots of people wanting to go straight on have to move one lane to the right and (cars mostly) wanting to turn left have to move one lane to the left.
What will be interesting to see is the behaviour of cyclists on the two way cycle lane, and the diagonal cut through from Millbank onto it. I'm sure there's going to be a load of cyclist/pedestrian aggro once it starts being used. I know I'm not looking to my run commute coming through exactly this bit every other day.
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Greenbank
@MultiGrooves
I kinda meant "toward" ... a bit inaccurate but you're correct it's Grosvenor Rd.
To my eyes it looks like they have much less space in which to travel straight ahead. It'd work better if the cycle lane had solid lines where motorists were not allowed to enter and would have to give way to those going straight ahead instead of those forcing their way across the cycle lane to turn left. Better still stagger the lights to allow cyclists to get through then engines.
Unless I've got something massively wrong....