As Daesh and other terror groups linked to the so-called Islamic State appear to be happy to die for their cause arrest and an extreme length of time in prison could be costly but worth every penny.
In this case the civilian damage is not as bad as it could have been. The footage has echoes of the men killing Lee Rigby however.
It has to be a worrying development coming just days after the UK launched bombing airstrikes in Syria. The British government however still advises us all to go about our daily lives as normal but be extra vigilant.
As Christmas approaches city centres and public transport tend to be heaving.
Also this week a terror attack that killed 14 in San Bernardino in the USA appears to have some links to Syria.
#YouAintNoMuslimBruv is trending on Twitter Sunday and has been called a "very British hashtag".
In footage of the stabbings at Leytonstone tube station a man can be heard telling the 29-year-old attacker that he 'aint no Muslim bruv'. And we will all echo that.
Yes we Brits are quirky to say the least.
The image of a letter, from neighbour to neighbour, was shared on Facebook and if it is genuine says it all.
It refers to the Tory government's decision to launch bombing airstrikes in Syria.