If Lord Hutton criticises the government in any way, it will be a test of its integrity to accept collective responsibility and not simply allow one minister to take the wrap, he said.

BBC: Howard boosts Tory spirits

Rod Sheard, of Populous, which designed and built the stadium, said the wrap was one of the last parts of a four-year-old design.

BBC: London 2012: Chemical company Dow funds stadium wrap

He said he would wrap up meetings in Tokyo and return to the UK over the weekend.

BBC: David Jones