In the discography, they included a small "Did you know" section inside each record...
Nice little detail.
For me it's strange that they never listed who plays piano on the first DS album. According to Pick Withers, it was Mark.
it could also have been David as he learned piano during his childhood, and he plays piano on Portobello Belle on the Barbarella concert
and he is credited "keyboards" on the live at BBC (although I think it's a typo here)
it could also have been Muff Winwood
organ part during In the gallery chorus
and some little piano notes on Wild west end (intro and "chinatown" line)