Career
He placed second in the 10,000 metres at the 1969 European Championships. Tagg competed in the 10,000 metres at the 1968 Summer Olympics in Mexico City, placing 13th. Two years later in Helsinki Tagg placed seventh, setting his eventual personal best of 28:14.65.
He also set his personal bests for two miles (8:282) and 5000 metres (13:414) that year.