Pressure Drop was an early album in RP solo career,a good guide to his later work.
I first saw Robert singing with Alan Bown Set,replacing Jess Roden ( who was no slouch) .
Moving on to sing with Elkie Brooks in Dada then Vinegar Joe.
The rest they say is history,but sadly missed ,taken from the music scene way too early.
I was fortunate to have a lady friend who had the good taste to buy this album for me.
Listen to it a soon as you can you will be suitably satisfied to have discovered it.