The Principal Act is amended by substituting for section 37 the following:

"37.

(1) The Tribunal shall consider an appeal made to it under section 34; in considering the appeal, unless the issues in the appeal do not relate to the value of property, the Tribunal shall achieve a determination of the value of the property concerned that accords -

(a) with that required to be achieved by section 19(5), or

(b) in the case of an appeal from a valuation made under section 28, with that required to be achieved by section 49.

(2) Having considered the appeal, the Tribunal may, as it thinks appropriate -

(a) disallow the appeal and, accordingly, confirm the decision of the Commissioner, valuation manager or revision manager, as appropriate, or

(b) allow the appeal and, accordingly, do whichever of the following is appropriate -

(i) decide that the circumstances referred to in section 28(4) existed for the exercise of the powers under that section,

(ii) in accordance with the matters set out in section 19(5) or 49, as appropriate, increase or decrease the valuation as stated in the valuation certificate,