Cameron and Clegg face a series of revolts over major policy issues from within their own ranks Planning The Prime Minister and deputy Prime Minister together agreed to scrap planning restrictions on extensions up to eight metres - doubling the current exemption. But grassroots Lib Dems have voted against the plans at party conference. They told ministers that the proposals would "blight homes, threaten their privacy and reduce the value of their homes." Secret justice Nick Clegg grudgingly signed up to this Coalition policy after demanding changes to limit which cases can be heard in private. But Lib Dems at the conference also voted against this plan, meaning it will be very difficult for the deputy Prime Minister to back it in Parliament. The proposals would allow courts and inquests to hear evidence from intelligence services behind closed doors. Regional pay Senior Conservatives are trying to vary public sector pay in each region to reflect costs of living. However, Lib Dems voted at the conference to block any moves to expand regional pay. They claim it would "sacrifice the principle of equal pay for equal work." Mansion tax More wealth taxes has been a big theme for the Lib Dems in Brighton. Lord Oakeshott, Tim Farron and other party faithfuls claim the Tories are almost persuaded of the case for higher rates for properties over £2 million. However, George Osborne resisted this proposal at the last budget and will be well aware of its unpopularity with wealthy supporters and donors. Same-sex marriage The Lib Dems are strongly in favour, but David Cameron has been warned his support for homosexual weddings is losing him support in the Conservative heartlands. Even several cabinet ministers, such as Owen Paterson, are sceptical. Green issues This has emerged as a major split at leadership level. Danny Alexander, the Chief Secretary to the Treasury, and Ed Davey, the Energy Secretary, have publicly accused Conservatives of blocking plans to increase energy from renewables, such as wind farms. They want a commitment that Britain will produce all electricity from green sources by 2030 - even though the Tories, notably George Osborne, are not convinced.