Ministers held crisis talks last night to avert a rebellion over David Cameron’s planning ‘free-for-all’ as it emerged it could lead to 40,000 unsightly extensions being thrown up each year. Potential Tory and Lib Dem rebels were invited to a ‘drop-in session’ with planning minister Nick Boles as it emerged that at least 20 MPs are planning to oppose the government in a crucial vote today. Zac Goldsmith, the environmentalist Conservative MP, today tore into the proposals as 'bad, clumsy politics' which will prove deeply unpopular without any evidence that it will solve any problems. Anti plan: Zac Goldsmith, Conservative MP, will vote against the law which will double the length of extensions that people can build in their gardens without planning permission Coalition backbenchers are furious at the controversial laws which will double the length of extensions that people can build in their gardens without planning permission. They plan to vote for an amendment allowing loc