Defending the record of Lib Democrat ministers since, Ms Williams said they had blocked Conservative plans to cut inheritance tax and "ensured the richest in society paid five times more of their wealth in tax".

BBC: Welsh Lib Dems: Party at 'turning point' says Williams

The Commons meets at 2.30pm on Monday for Home Office questions, after which the Conservative Mary Macleod proposes to follow-up the Succession to the Crown Bill by removing male preference in the inheritance of hereditary peerages and estates.

BBC: Week ahead