Ah, it sounds like the links you previously saved may have been disabled, Geoff.

From https://sounds.bl.uk/:

British Library Sounds
Listen to a selection from the British Library’s extensive collections of unique sound recordings, which come from all over the world and cover the entire range of recorded sound: music, drama and literature, oral history, wildlife and environmental sounds.

We are delighted to announce that in 2020 we will begin adding the recordings available here to a completely redesigned website which will include many additional recordings.
In anticipation of the change, this site’s notes, tags, favourites, playlists and embedding features have been disabled.