The story of David Bowie’s final Ziggy Stardust gig is well known. From the stage of the Hammersmith Odeon and in-front of a frantic audience of fans, celebrities and acolytes, he masterfully secures the morning’s front pages by declaring it to be “the last show we’ll ever do”.

The subsequent party at the Café Royal, “Ziggy’s Last Supper”, also contains a few surprises and one particularly has never had a satisfactory explanation. There are a set of photos, staged group shots, featuring David and his peers, radiating in the success that has finally arrived. However, there is a stranger, an unknown man, drinking and smoking next to Angie Bowie. In other shots, he’s laughing and joking, part of the fun and celebration. Fifty years later, it seems that history has not recorded the identity of David Bowie’s mystery guest.