18(1)A person does not contravene this Part of this Act, so far as relating to sexual orientation, by doing anything which prevents or restricts a person who is not married from having access to a benefit, facility or service—E+W+S
(a)the right to which accrued before 5 December 2005 (the day on which section 1 of the Civil Partnership Act 2004 came into force), or
(b)which is payable in respect of periods of service before that date.
(2)A person does not contravene this Part of this Act, so far as relating to sexual orientation, by providing married persons and civil partners (to the exclusion of all other persons) with access to a benefit, facility or service.