http://www.legislation.gov.uk/id/asp/2013/11

SCHEDULE 5Multiple dwellings relief

PART 5Withdrawal of relief

Relevant period

21

“The relevant period” means the shorter of—

(a)

the period of 3 years beginning with the effective date of the transaction, and

(b)

the period beginning with the effective date of the transaction and ending with the date on which the buyer disposes of the dwelling, or the dwellings, to a person who is not connected with the buyer.