What's interesting is this: that sign cost money to make, to install. Why is it here, opposite the BRI, but not elsewhere? Is this particular crossing considered more dangerous than any other pedestrian crossing? Do more people here get run over by not waiting for the green man than elsewhere?
One would think, that given the hospital, the ambulances and the A&E service are on the other side of the road, if you were going to step out and hit a car, bike, bus or motorbike, this is the place to do it. Yet the council felt that in fact, this place merited a warning sign.
Perhaps there is something about the BRI's ability to handle road traffic accidents that is behind the sign. In which case a more accurate sign would be something like "Do not cross on the red man as the BRI can't handle run over pedestrians". That would be more accurate, and be far better at making people behave.