So, when I export from the BBC My Tracks page to Spotify, it appears to 'find' all of them, but when I go to Spotify the BBC Music Playlister playlist hasn't updated. It's been the same 124 tracks for over a year.
It looks like the playlist is one of your own personal playlists. It will only update if you add songs to it yourself. If the BBC has a certain feature that adds songs to your playlist but this doesn't happen anymore, we recommend reaching out to the BBC as they might be able to tell you more about this.
Hope this helps. Let us know if you have further questions.
This isn't a personal playlist I have created. As I've tried to explain, maybe not clearly, this, until November 2016, was automatically updating by exporting from BBC Music. It automatically names it BBC Music Playlister. It even links me to that playlist in Sopotify, but in Spotify none of the new tracks are showing, despite BBC My Tracks saying they have successfully been exported to Spotify. I can't understand why Spotify wouldn't know about this feature, as surely it involves some kind of partnership between Spotify and BBC Music.