Treasury minister Danny Alexander said the EU was "one of the central pillars of British prosperity and security".
"Membership of the EU gives market access to British firms, makes us more attractive to overseas investors, and underpins more than three million British jobs," he said.
"EU trade deals with the US, India, Canada and Japan will be worth billions to the UK economy but could not be won by the UK alone."
"Britain must work with our allies for change from within to ensure the EU continues to take reform seriously.
"The isolationists are reckless with our prosperity and security. We cannot let them succeed."
More top news
The former Friends star will front the popular BBC Two motoring show when it returns in 2017.
Viewers praised the "brave" TOWIE star after she opted to have the hook pulled out on Bear Gryll's The Island rather than in hospital.
Labour is to announce it will ban fracking if it wins the next general election.