ISIS and al Qaeda present a “resurgent” threat to the United Kingdom, the head of the country’s domestic security service warned in a rare public intervention on Tuesday, as he outlined a changing landscape of terrorism that is increasingly relying on children and on the internet.

Britain's top intelligence officer revealed the alarming scale of threats facing Britain and the terrorism trend "that concerns me most".

MI5 director general Ken McCallum says they have seen thwarted 43 late-stage attack plots from terrorists since March 2017