3. Any sum directly attributable to the proceeds of sale of—
(a)any premises formerly occupied by the claimant as his home, or
(b)any premises which the claimant continues to occupy as his home and which were occupied by him as his home immediately before the compulsory acquisition of those premises from him under any statutory provision,
which is to be used for the purchase of other premises or land intended for such occupation within 26 weeks of the date of sale or such longer period as is reasonable in the circumstances to enable the claimant to complete the purchase.