Spencer was an instructor at Denham when I trained there in the early '90's.
At a fun kart meeting at either Heathrow or Uxbridge (memory gone!)I asked him whether he had done any racing before, 'A little' was his modest reply -little did I know at that time he was heavily in to vintage Bentleys!!!
When his students got their PPL, he brought his P51 in to Denham with the fuel tank in the cockpit removed and took them up for a blast. I, sadly, WASN'T, one of his students....I seem to remember the 'plane had strobes on the gun ports so it looked as though it was firing! Could have been silver and blue -again, memory fails me!
DOC