In reply to Rog Wilko:
Some folks are really into restoring old computers, and might want the floppies. There's also a collection of old hardware in labs and factories which has aged better than the built-in computer, and the people responsible for running them often need disks to get the data over to something newer. Stick them on eBay £10 for the lot untested and see if anyone bites - probably not going to leave you with much money after postage but beats binning them. As with any storage medium, have a think if there is any personal data on them first.
Can't think of anything to do with the leads if they aren't identified.