Why aren't local lockdowns working?

Pubs, bars and restaurants in Edinburgh, Glasgow and much of Scotland’s central belt will be closed from Friday at 6pm, while pubs, bars and restaurants in Merseyside, Newcastle and Manchester will follow suit on Monday. This means the majority of people in Scotland and Wales are now under some form of lockdown, and England may be heading the same way. In Northern Ireland, meanwhile, Diane Dodds, the economy minister, has called on Westminster to provide additional funds in order to facilitate the possibility of a further lockdown.