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@greenbank my interpretation was that with the lights on yellow and a car already ahead of him in the box, his exit then can't be construed as clear as he can't guarantee exit before priority is given to opposing traffic.
The exit road the other side of the box junction is clear. You don't have to go through box junctions one at a time just in case the vehicle in front decides to stop for no reason (despite the road ahead being clear).
I don't see what creates the need to guarantee exiting the box junction by the time the lights change green for another direction. The highway code simply requires him to avoid the situation where he's guaranteed not to clear the box junction (because the exit lane is not clear). That's not the same as guaranteeing that he will clear the box junction.
The mention of yellow boxes on a roundabout is a red hering
The mention of yellow boxes on a roundabout is simply because I quoted the full text of HWC Rule 174.
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Greenbank
@The_Seldom_Killer
@greenbank my interpretation was that with the lights on yellow and a car already ahead of him in the box, his exit then can't be construed as clear as he can't guarantee exit before priority is given to opposing traffic. The condition of the lights may not be mentioned but I think still relevant as yellow boxes only occur at signalled junctions right? The mention of yellow boxes on a roundabout is a red hering because there is no right turn that you are allowed to stop for and therefore you must clear it in one move.
You could argue that at the point of the light turning yellow he may have looked in his rear view mirror and perceived it unsafe to stop. However I argue that on the approach to a yellow box junction an experienced and professional driver would have begun his junction planning much further back and had time to stop.