The pedestrian crossings at this roundabout are very deliberately placed in such a manner to encourage "the smooth flow of traffic"; far back from the roundabout so that there is a tarmac "reservoir" between the roundabout and the crossing to try and contain vehicles off the rounabout when the lights go red.
What this means is that the crossings are not on a pedestrian desire line (hence all the fencing around the junction to enforce their use) and make people take a time-consuming deviation from their route just to cross the road. It's also a double-stage crossing, with a central island pen for pedestrians, again to keep the traffic flowing but slowing down pedestrians.
Every time you design a junction like this, you have the potential that someone who is running late (or a child, who hasn't got the fear of the road yet driven into them) decides to run out onto the road, only to find a vehicle is coming off the roundabout at a high speed...
That roundabout, with it's wide exits (single lane roads widening out to double or even triple lanes), gentle corners, protected left-turn filter lane, badly placed crossings and miles of "safety" fences belongs back in the 1960s when it was built.
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