It's an unfair contradiction in current uk law. That wrt state benefits people are treated 'as if they are married' when it is in the govts favour to do so, and not when it's in the recipients favour.
I'm all for 'if you want the rights of marriage get married' but with state benefits the govt acts unfairly.
This has become particularly true with UC, where if you live with someone it's a joint claim, perfect for financially and otherwise abusive partners to enable that abuse AND trap the abused partner. And that's before you even get into the despicable 'rape clause'.
So for that reason I think it's fair that if the govt treated them as if they were married while he was alive, that they have to do so after his death too.
If the govt wants to not pay benefits in these circumstances based on the lack of marriage, then those living together and claiming benefits should not have to have their partners income and/or savings/assets inc in their claim nor be required to make a joint claim of not married in the case of UC.
Unfair for govt to try and have it all ways.
" the problem is the inconsistent way the government applies benefit rules. You are either a household when a partner moves in for all benefits or you are not. The government needs to make that decision." Exactly! Unfair to have it one rule before death and different rule after - pick one rule and apply it to all, but personally I think if not married it should all be kept separate.