The amount of a disturbance payment shall be equal to—
Where the displacement is from a dwelling in respect of which structural modifications have been made for meeting the special needs of a disabled person (whether or not the person entitled to the disturbance payment) then, if—
for making those modifications, the amount of the disturbance payment shall include an amount equal to any reasonable expenses incurred by the person entitled to the payment in making, in respect of a dwelling to which the disabled person removes, comparable modifications which are reasonably required for meeting the disabled person's special needs.
Any dispute as to the amount of a disturbance payment shall be referred to and determined by the Upper Tribunal . . . .