On Monday, Sainsbury’s – which shares its chairman, David Tyler, with Hammerson – and Asda agreed a £13bn merger that if approved would see the UK’s second- and third-biggest supermarket chains join forces to create the country’s largest single retailer, operating as distinct brands under the Sainsbury’s corporate umbrella.

Sainsbury’s and Asda say the deal – which will almost certainly be closely scrutinised by the Competition and Markets Authority (CMA) – would allow them to slash prices and provide a better service to customers. But what impact would it have on their vast property estates?