The Rocky Horror Show - 1973 Original London Cast

Wikipedia says that Julie Covington played Janet in this production, but she's not credited here. Did another performer do the recording, or is it an oversight? Anyone know?

According to the RHPS wiki, "Although Belinda Sinclair is featured on the Original London Cast Recording, Julie Covington was the first to play Janet in previews but left the cast before the first night after an accident."

Ah! Thank you.