Saw a post about this on a friend's page: The BBC is releasing over 16,000 sound effects.

https://www.musicradar.com/news/the-bbc-is-letting-you-download-more-than-16000-free-sound-effect-samples-from-its-archive

They're released under the RemArc license, so can only be used for “personal, educational or research purposes.” Of which I suspect LD is probably a good candidate.

Archive can be found at: http://bbcsfx.acropolis.org.uk/