Hi Martyn
A few have that I know of, myself included. Unfortunately, there's not very much to say. I made some recordings to the highest standard I could, then I compiled a list of publishers who I thought fitted the music I'd made. Then I contacted them. And I waited. Then I contacted them again, and a third time if I hadn't heard from them.
A couple took the bait, but only one of them actually used tracks. I wrote a whole album for the other publisher who eventually pulled out, but it wasn't all for nothing. I send the album to another publisher who commissioned a track from me (even though they didn't want my album either).
All it took was a half dozen well produced tracks and a
lot of researching/ sending/ chasing.
Hope that helps