What to do with an expired passport?

I've kept all mine as a memory of what I looked like at ten year intervals. (I do have some nice stamps.) I doubt if I'll be using it again!

I’ve also kept all mine for the same reasons as rockgran my GD was amazed at my 17 yr old pic.

All mine are kept for the same reason as rockgran

? sorry for the second one.

We’ve kept our old ones, some have Visa entry stamps in them, one is from the USSR!

I've kept mine as well along with my late SiL's where one is full to the brim with stamps from her travels/cruises. It's like a geography book

Keep all mine and DH’s, marvel at how youthful and quite attractive we were!

The clothes I was wearing bring back memories, one photo shows a particular blouse I remember very well.

I keep mine, just for sentimental reasons and the hilarious photos. Also I had one with a very low passport number indicating - as I used to say - that I was the 70th most important person in the UK

Kept all mine too and I also have visas including USSR like you oopsadaisy

I lost mine years ago and had problems renewing. I think I left it when I moved house

I look back nostalgically at the Chinese visas in mine.

I had a passport stolen by an ex and had to get a crime reference number before I could get a replacement. Ex denied it of course, but had the humiliation of the police turning up on the doorstep to interview.

I have mine too.
No doubt they will get shredded one day.
They are no use, of course, but a nostalgic look at trips overseas.

Yep, kept mine to remind me of how I looked when I was young and pretty.

I ripped the pages out of mine and put them through the shredder - don't really understand why the Passport Office sent it back to me ?.

Passports are and remain the property of HMPO. Over last few years, you have needed to tick a box if you want the old one to be returned so if you didn't do this and they returned it anyway just return it to them or as someone else said shred it. Some people like to keep them for sentimental reasons but don't just bin it in its entirety.

I shall be keeping mine. It's become an heirloom.

I've never kept any of mine. The last one was chucked on the fire.

Keep it in a secure place.

We’ve kept ours for the sheer nostalgia value. Even the flimsy Visitors’ Passports we just picked up at our local post offices back in the 60s on presentation of a birth certificate, when we probably weren’t sure we’d ever go abroad again. Even without the visas and entry and exit stamps, they’re an interesting record of us over the years.