The Parliamentary Commissioner for Standards is an Officer of the House of Commons. His or her job is to supervise the Register of Members' Interests and to advise the Committee on Standards and Privileges about issues relating to the MPs' Code of Conduct. This term of appointment is fixed by a resolution of the House of 26 June 2003 at five years, and is non-renewable. The Commissioner can be dismissed only if unfit or unable to carry out their duties.
Further information on this subject can be found from the following link.
Office of the Parliamentary Commissioner for Standards