Consider taking a private car to get to Luton or Stansted airports for your departure from London.
A driver will collect you from your hotel (available only for hotels whose postal code begins with the following: WC1, WC2, EC1, EC2, EC3, EC4, E1, SE1, N1, SW1, SW6, W1, W2, W4, W3, NW1, NW3 or NW8) and take you straight to the airport!
No need to struggle with luggage on public transport - this private transfer will enable you to avoid all the usual trials and tribulations of airport trips.