Earlier a spokesman said the museum has not asked Mr Brown to pose for a waxwork because he has not won an election.

But Downing Street sources revealed that a senior company executive wrote to the Prime Minister's office last week asking him to sit for its artists.

Earlier Tussauds' public relations manager Ben Lovett said: "At the moment we have no plans to make Gordon Brown.

"We are going to wait for a general election to see what will happen because that's the ultimate test of public opinion.

"We are always continuing to monitor public opinion so if there's a surge of support, then we will reconsider."

But it emerged Nicky Hobbs, global head of external relations at Madame Tussauds, wrote to Number 10 on March 3.

She wrote: "I am honoured to tell you that the Prime Minister, Mr Gordon Brown, has been selected to be honoured by the Tussauds team and be amongst the very select group of people that are made into wax figures."

A Downing Street source said: "This is all rather puzzling given the Madame Tussauds team were only in touch last week asking Gordon to sit for them."

Later Mr Lovett rowed back from his earlier statement and said: "We are just waiting to hear from Downing Street."