Mayoral candidate Caroline Pidgeon has said it would be "insane" to leave the EU, responding to news that Britain will vote on a referendum on June 23.
With London the number one business and financial centre in Europe.
It would be insane to leave and would cost tens of thousands of jobs in London alone.
Together the EU has created the world's largest free trade area, delivered peace, and continues to give the Londoners the opportunity to live, work and travel freely.
History shows that London - and Britain - is better when it is united with Europe
The Liberal Democrat candidate said she will make the case for Britain to stay in the EU.
Boris Johnson has said that he will join the campaign for Britain to leave the European Union to get a 'better deal' for the country.
The front-runners to replace Boris Johnson as London mayor were today pitched into a new battle on opposite sides in the debate over Europe.
Boris Johnson's in/out dithering over Europe can be traced back to a forgotten report commissioned by London's mayor almost two years ago.