The extra �3bn is not guaranteed, warned the report's authors

The country could outperform global tourism growth by 50% in the four years before and after the games, according to researchers.

They said there could be an extra 6.6m visitors to the country between 2007 and 2016, generating the extra revenue.

Hotel chain Travelodge reviewed tourism data from previous Olympic host cities including Seoul 1988 and Athens 2004.

'Not guaranteed'

A market worth �14.2 billion today would rise to �24 billion in 2016 creating 75,000 more tourism jobs for the economy, according to the findings.

Report author Kurt Janson said: "If tourism to the UK follows the trend of previous Olympic host destinations, there is the potential to generate �3 billion in additional inbound tourism expenditure and 75,000 new jobs over the next 10 years.

"However, these benefits are not guaranteed, but require significant additional Government funding for tourism if they are to be achieved."

A spokesman for the Department for Culture, Media and Sport said the tourism industry needed to "up its game" in the run up to 2012 to ensure the country reaped the potential economic benefits.