I'm posting here rather than in Money because there are more views here.
I've just been listening to Radio 4's Money Box and there's a piece on there saying if you have a large age gap, the full pension may not be paid out when the older person dies. It's at the pension company's discretion but they can deduct a certain percentage for every year over ten years' difference.
The link is to the programme but it's just been on and you might have to wait a few minutes before it's available.
It's well worth checking out what you or your partner's pension provider says, if you fall into that category.