The Mayor of London has joined an alliance of the capital's biggest business groups to slam the Government's revamp of business rates, and push for a reform to the system.

This comes after a revaluation of rateable value, which will mean that some business will have to pay 150pc more when it is brought in next April.

The alliance of 43 bodies includes London Councils, London First, the London Chamber of Commerce, the Federation of Small Businesses London and the New West End Company, which in total represent 16,000 businesses.

The group has called for a full review into the rates system and for more realistic proposals to combat the changes, such as more time to prepare for the hikes.