Do you have 5.25" and 8" floppy disks that are spare, low-quality, degrading, or just generally in bad shape?

I'd like to take my floppy disk data recovery game to the next level. I have equipment, but there's no substitute for experience. Therefore I'm looking for loose collections of old floppy disks to practice on. I'm especially interested in working with disks where the binder affixing the media to the donut is starting to fail.

I'm in London; will pay shipping; can pick up disks around here as well. Boosts are appreciated!

@stepleton I've got a big box of maybe 50 old BBC Micro 5.25" ones somewhere. Is that the kind of thing?
@GypsumFantastic yes, that's just the kind of thing I'm looking for, especially if they are cheaper, lower-quality disks that are harder to recover! But to stress, I'm looking for disks to use for practice as I develop my technique, so while I would do my best, there's a chance that any data sent my way would be lost forever...
@stepleton Yeah I was going to throw them out. They're all yours. I think a lot of them are originals from the software publishers. I'm in Yorkshire so dropping them off in person isn't really going to happen but postage shouldn't be too much.