The third most common job is general office clerk.

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But Scotland's senior judge, the Lord Justice General, Lord Gill, sitting with the Lord Justice Clerk, Lord Carloway, and Lady Paton, rejected his claim.

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Mr Bercow said he had consulted the attorney general and the solicitor general before granting the police's request and had also sought the advice of the Clerk of the House, who advises the Speaker on procedure and parliamentary privilege.

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