Within the R160 controlled area, for example, they must fly above the River Thames, which minimises the risk of crashing into a built-up area.

BBC: London helicopter crash: What are the rules for pilots?

Cleveland actually lost people, with a population decline of 8%, while expanding its built-up area by 33%.

ECONOMIST: They can yet be resurrected | The

Wildlife experts have said the sighting of the normally-shy deer so close to a built-up area is "extremely rare".

BBC: 'Shy' deer with sheep near homes in Lancashire