HK 13.5. If the applicant and the BN(O) Status Holder are not married or in a civil partnership, all the following requirements must be met:
(a) they must have been living together in a relationship similar to marriage or civil partnership for at least the two years before the date of application; and
(b) any previous relationship of the applicant or the BN(O) Status Holder with another person must have permanently broken down; and
(c) they must not be so closely related that they would not be allowed to marry in the UK.