Yeah, Wakeman pretty much lived at A&M studios back in those days, all kinds of acts would come through to record singles or jingles or whatever, and he was the go-to guy for piano and/or keyboards. His most obvious contribution to this song is the glissando as the piano comes in at the beginning. Rick actually argued about this one, saying the song didn't need any keyboards, but they wanted that glissando in there, and the suit asked him if he wanted the 9 quid or not. Wakeman says he got paid 9 pounds for a gliss, but he comps chords throughout. You can hear the piano in there, mixed in with the guitars.