Sir Oliver has challenged the Government in Parliament today on electricity supply in the current conditions and whether our power grid is sufficiently resilient.

Sir Oliver said: "When I was in government we conducted one of the largest exercises, Exercise Mighty Oak, which involved more than 4,000 people testing the effect of a power outage. That exercise demonstrated that it cascaded very rapidly and that it very rapidly affected water supply, transport and other public services. Will the Minister confirm that he has had an opportunity to read the findings from that exercise, and can he update the House on what point the Government have reached in implementing its recommendations?"

The Minister replied: "I pay tribute to the right hon. Gentleman, and to all who were involved in that incredibly important exercise. I was not aware of it at all until I came into this job and read the full report, as well as the breakdown of all the actions that had been started during his time in office and have been continued by officials now. As he says, the cascading impacts of a national power outage are extraordinary and very quick, which is why we are first investing in the grid to ensure that that remains a very low risk on the national risk register, and secondly taking forward all those actions. I do not have the detail in front of me, but very few of the actions remain open; most have now been completed. We are also, across Government, continuing to organise exercises—on a much smaller scale—to ensure that Ministers are prepared and that we continue to keep on top of the actions, because these are not one-time events. The water industry, to which the right hon. Gentleman rightly referred, must continue to look at preparedness. That is the wider work that we are taking forward on resilience."