On 7 July 2005, 52 people died after suicide bombers detonated devices on London's transport network - it was the day Britain's terror threat changed forever. Fifty-two thousand petals fell in St Paul's Cathedral as families and survivors remembered those who died in the 7 July terrorist attacks in London 20 years ago. Sky's Martin Brunt has this report. Read more: https://news.sky.com/story/i-was-reporting-in-london-on-the-day-of-the-7-7-bombings-heres-what-happened-13391968 #bombings #london #