Riba found the average three-bedroom home is 88 sq m (947 sq ft), which is 8 sq m (86 sq ft) short of the recommended minimum.

BBC: A life lived in tiny flats

Sirius proposes to process the ore at a site at Wilton, near Middlesbrough, and plans to transport it via a steel pipeline buried a minimum of 3ft 11in (1.2 m) below ground.

BBC: Sirius propose North Yorks pipeline to transport potash