Supermarket expansion concern
Fears have been voiced about the growth of the 'big four' supermarkets after BBC research found at least 577 stores were approved in the UK in two years.
Planning authorities gave Tesco, Sainsbury's, Asda and Morrisons permission for at least 480 stores in England in the two years to 1 November.
In Scotland at least 67 stores were approved and there were at least 22 in Wales and eight in Northern Ireland.
Campaigners say the stores are putting independent traders out of business.
Panorama's Paul Kenyon reports.
The full BBC report on supermarkets will air at 2100GMT on BBC One.
22 Dec 2010