23Revocation of arbitrator’s authority
(1)The parties are free to agree in what circumstances the authority of an arbitrator may be revoked.
(2)If or to the extent that there is no such agreement the following provisions apply.
(3)The authority of an arbitrator may not be revoked except—
(a)by the parties acting jointly, or
(b)by an arbitral or other institution or person vested by the parties with powers in that regard.
(4)Revocation of the authority of an arbitrator by the parties acting jointly must be agreed in writing unless the parties also agree (whether or not in writing) to terminate the arbitration agreement.
(5)Nothing in this section affects the power of the court—
(a)to revoke an appointment under section 18 (powers exercisable in case of failure of appointment procedure), or
(b)to remove an arbitrator on the grounds specified in section 24.