Didn't think this was a thing in UK - I was right - Wikipedia:

the United Kingdom, does not have jaywalking laws; its Highway Code relies on the pedestrian making their own judgment on whether it is safe to cross based on the Green Cross Code. Pedestrians do have priority over turning vehicles. Rule 170 of the UK's Highway Code instructs a driver to "watch out for pedestrians crossing a road into which you are turning. If they have started to cross they have priority, so give way."