A person who qualifies for an old age contributory pension may also qualify for an adult dependant allowance provided that he/she is wholly or mainly maintaining that person.
Under existing provisions a person is regarded to be wholly or mainly maintaining another person where the person—
(a) is one of a married couple living together or one of a cohabiting couple and the person's spouse or partner is not in receipt of a social welfare payment in his or her own right and does not have weekly income in excess of £60;
(b) being separated from his or her spouse, is contributing towards his or her spouse's maintenance by a weekly amount of at least £37.50 (which is the adult dependant allowance rate) where the spouse is not cohabiting with someone else as husband and wife and the spouse does not have weekly income in excess of £60; or
(c) being an unmarried, widowed or separated person, is residing with a person aged 16 or over who does not have weekly income in excess of £60 and who is caring for a child dependant of the person. In the case of a separated person, he or she must not be living with or be wholly or mainly maintained by his or her spouse.
I have no plans to change the current arrangements.