A typical series contains 15 episodes – eight heats, four quarter finals, two semi-finals and the grand final, apart from the first series, which consisted of nine episodes - six heats, two semi-finals and a grand final. Occasionally, a celebrity or charity special will be broadcast after the grand final. Mini series, such as the final season (series 8), would consist of three episodes - two heats and a grand final, whilst the two International series consisted of seven episodes - four heats, two semi-finals and a grand final.
