Yes, but again, "should" != "must".
Yes, but considering that the police are lecturing cyclists about helmets and hi-viz, both of which are recommendations then I don't know why they wouldn't advise drivers who are regularly blocking crossings at every phase of the lights.
Interestingly I notice another rule which states
Pelican crossings which go straight across the road are one crossing, even when there is a central island. You MUST wait for pedestrians who are crossing from the other side of the island.
This is a must and yet how many drivers will wait for pedestrians crossing before the island to complete to the other side if there is an island in the middle? I have never seen this happen. It makes me realise what a raw deal we get as pedestrians and that the police aren't really interested in helping them very much - otherwise they would be making sure that their facilities aren't rendered inoperable by other road users.