If you are trapped in the lift press the bell button to ring the emergency bell in the ground floor foyer. Stop ringing the bell from time to time to allow you to hear anyone trying to contact you! Once someone has made contact they should ring 999 for the fire brigade. (Your own mobile will probably not work from the lift). Then call the lift maintainer on 020 8544 4888 to get the lift repaired (Lift No 1 is in Surbiton Block and Lift 2 in Kingston Block). Due to the height of the buttons above the floor, smaller children should not use the lift alone.
Do not hold the lift by blocking the door! It prevents use by others and may cause damage to the door mechanisms.