During his school years Marcus suffered from alcoholism and an eating disorder.  He sought help and received successful treatment.

The joke's on him

One of Brigstocke's best known jokes - 'If Pac-Man had affected us as kids, we'd all be running around in dark rooms, munching pills and listening to repetitive electronic music' - has been bandied around the internet for years and has been attributed to many different people, but Marcus is rightly vehement about his ownership of it.