I never knew Nick Mason had a Strato's! Google brought up an article that says:

'MANY OTHER FERRARIS HAVE COME AND GONE over the years, including a Dino 246 GTS which became a part exchange for a Lancia Stratos. “I am really sorry I sold the Lancia,” Mason says. “It was a very tricky car but really exotic and an extraordinary idea.'

He's always had impeccable taste.