Blue for you Sammy
Numbers 1,001 to 28,000 also have a blue number on a white background and will start at the Blue Start. Use Blackheath Station if travelling by train.
Numbers from 28,001 to 33,250 you will have a green number on a white background and will start from the Green Start on Blackheath. Use Maze Hill Station.
Numbers 33,251 to 59,000 will have a red number on a white background and will start from the Red Start which assembles inside Greenwich Park. Use Greenwich or Maze Hill stations.