4(1)This paragraph applies where—
(a)the court imposes a custody and community sentence as a further sentence,
(b)the court frames the sentence to take effect in accordance with paragraph 1(2) or (3), and
(c)the prisoner’s previous sentence (or one of the prisoner’s previous sentences) is a custody and community sentence.
(2)In determining the date on which the previous sentence expires, no account is to be taken of the period of confinement served under the custody part of the further sentence.
(3)In determining the date on which the further sentence expires, no account is to be taken of the balance of the previous sentence.
(4)The balance of the previous sentence is the term of the sentence less the custody part of the sentence.