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Professor Ciaran Martin, the cyber-security expert who will help with the OBR leak investigation, is currently Professor of Practice in the Management of Public Organisations at the Blavatnik School of Government at the University of Oxford.

His biography there explains:

Ciaran led a fundamental shift in the UK's approach to cyber security in the second half of the last decade. He successfully advocated for a wholesale change of approach towards a more interventionist posture and this was adopted by the Government in the 2015 National Security Strategy, leading to the creation of the NCSC in 2016 under his leadership.

Over the same timeframe, the UK has moved from joint eighth to first in the International Telecommunications Union's Global Cybersecurity Index and the NCSC model has been studied widely and adopted in countries like Canada and Australia.

We need to get to the bottom of what exactly happened. We're going to do a full investigation. There'll be a full report to parliament. We're going to do that work quickly so people can have assurance in our systems and that can be restored.