(1) If this section applies as a result of section 214, 215 or 216, the amount, if any, by which B's expenditure under the relevant transaction exceeds D is to be left out of account in determining B's available qualifying expenditure.

D is defined in subsections (2) and (3).

(2) If S is required to bring a disposal value into account under this Part because of the relevant transaction, D is that disposal value.

(3) If S is not required to bring a disposal value into account under this Part because of the relevant transaction, D is whichever of the following is the smallest—

(a) the market value of the plant or machinery;

(b) if S incurred capital expenditure on the provision of the plant or machinery, the amount of that expenditure;

(c) if a person connected with S incurred capital expenditure on the provision of the plant or machinery, the amount of that expenditure.

(4) This section does not apply if plant or machinery is the subject of a sale and finance leaseback (as defined in section 221), but see section 225.