11.—(1) The High Court has power—
(a)to recall any grant;
(b)to revoke any grant.
(2) Without prejudice to paragraph (1), where it appears to the High Court that a grant either ought not to have been made or contains an error, the High Court may call in the grant and, if satisfied that it would be revoked at the instance of a party interested, may revoke it.
(3) A grant may be revoked under paragraph (2) without being called in, if it cannot be called in.