Or English Premium bonds!
[en.wikipedia.org]

@FrayedBear My Great Aunt gave me a hundred pounds worth of English Premium Bonds in the mid 80’s. That would have been a lot of money then.

I have never won a single prize with those numbers.

@Zealandia I had several since childhood. Never won a brass razoo. Wouldn't know what happened to them. Can you claim after 50 years if they won?

@FrayedBear Good question.

As far as I’m aware, if you can verify that the Premium Bonds belong to you, then any winnings are payable. Do you know the numbers by any chance?

Are 50 year old Premium Bonds still valid?
Are my old Premium Bonds still valid? Yes. As long as you haven't cashed your Bonds in, they're still valid and they're still being entered into our monthly prize draws.

You can claim old premium bonds:
[nsandi.com]

I managed to sort out my old ones without too many problems.

@Zealandia Thanks. I wouldnt have a clue on numbers.

@FrayedBear If you give a name plus address that bonds were possibly connected to, that may be enough for NS & I to work on.