I'm not his biographer, but I'd always assumed he wrote his own stuff. There's often collaberations involved, but I'd be surprised to learn he wasn't the writer of his own songs.
'Typically' Bernie wrote lyrics and Reg put all the right notes in all the right places.
Like Bowie, mid 70's he had a superb band and raised the bar with them. Great songs, well recorded and superb live.
It was peak rock era.
Can't think of anything listenable since I'm still standing, which is naff, but good in its own charlie fuelled kitsch OTT 80's way.