Sir Julian Lewis: When a despicable incident of this sort occurs, be it at the gates of Parliament or on the streets of a university town, the community looks to the security agencies to be able to investigate and establish the motives for the attack, the background of the attack and whether any other people were involved. Does the Home Secretary agree that it is therefore both important and understandable that the intelligence community has the capacity to investigate people’s online life and the high-tech companies that provide these communications services have a duty, both morally and legally, to co-operate with the security community, so that horrible episodes such as this can be fully investigated and the findings established?

[The Secretary of State for the Home Department (Suella Braverman): My right hon. Friend makes some very pertinent observations. The emergency services work together to respond to suspected terrorist attacks, through the joint emergency services interoperability principles – JESIP – which are designed to improve joint working among all the emergency services. The JESIP doctrine complements the single-service and specialist multi-agency guidance. When a particular attack has an online element, which he refers to, we will enact our crisis response protocol, an element of practice that has been designed to deal with situations of that character.]