Section 255B | Payments to be cleared payments
From legislation.gov.uk
(1)A payment made to the Board of Inland Revenue or the Inland Revenue under or by virtue of this Part (otherwise than in cash) is to be treated as not having been made until the earliest date on or before which all the transactions that need to be completed before the whole amount of the payment becomes available to the Board are capable of being completed.
(2)In this section “the Inland Revenue” includes any person who is acting under the authority of the Board of Inland Revenue.