Sainsbury's move to a £2bn Kings Cross HQ is in doubt following development funding problems. The retailer has not yet signed the contract with developer Argent, because of speculation it may have trouble completing the project on time.

It was normal not to sign anything before a building was completed, said a Sainsbury's spokeswoman. “We are committed to moving the store support centre to Kings Cross in early 2011,” she added. Argent reached an 11th-hour deal with its partners last month after bank funding fell through.