12(1) Subject to such regulations as the Commissioners may think fit to make, the Commissioners may be required by any person to adjudicate with reference to any executed instrument upon the questions–
(a)whether it is chargeable with duty;
(b)with what amount of duty it is chargeable;
(c)whether any penalty is payable under section 15B (penalty on late stamping);
(d)what penalty is in their opinion correct and appropriate.