In a week that saw the government unable to access the Whatsapp messages of Westminster attacker Adrian Ajao, Dr Brandon Valeriano was one of four expert witnesses called upon by the Joint Committee on National Security Strategy (JCNSS).

The committee looked at the risks faced in the UK, the relationship between the public and private sectors, and the issue of international cyber norms and governance.

Find out more about the Joint Committee or watch listen to the Radio 4 programme - Yesterday at Parliament