The Ace Cafe Reunion Run, or the Brighton Burn-Up as its known, in September is one of the biggest, perhaps the biggest, motoring events to fill the tarmac along Madeira Drive - although its immediate competitor, the Brightona, grows ever larger as well. Some claims put the total number of participants as high as 40,000. But whatever, the city is certainly heaving with motorcycles of all shapes and sizes on the day.