The Treasury may make regulations for authorising any principal moneys which become payable on the redemption of any Government stock standing in the name of any stockholder, including a joint stockholder, who is of unsound mind or an infant or otherwise under disability, to be received by a committee, guardian or other person on behalf of that stockholder, and for authorising any such person to give directions on behalf of any such stockholder with respect to the re-investment of any moneys so becoming payable.