Twenty years since the 7-7 bombings, the Metropolitan Police commissioner says the force is now one of the most effective at stopping future attacks.

Sir Mark Rowley says its reaction to past terror incidents has helped, twenty years since the London atrocity.

Four suicide bombers hit three Underground trains and a bus, killing 52 people and injuring more than 770.

Survivor Adrian Heili, who was living in Morden at the time of the attacks, says they must not be forgotten.