He said he was not criticising the assembly government, which had been given detailed legal advice, but many people had their income published, including MPs.

BBC: NEWS | UK | Wales | Farmers' subsidy 'secrecy' anger

He has been consulting on a range of proposals including stopping MPs employing relatives and ending large pay-offs to retiring MPs.

BBC: MPs' second home profits 'should be surrendered'

The cross-party alliance, including 35 Conservative MPs, said it believed that the government "does not have a mandate to redefine marriage".

BBC: Same-sex marriage: 'No mandate', say MPs