Planning and Infrastructure Bill

David Mundell Excerpts

Thursday 13th November 2025 Commons Chamber

[Neil Duncan-Jordan]

Absolutely. Because of the nature of the constituency I represent, I know that chalk streams are extremely important and should be protected. They are our national inheritance, and we are their custodians. I really hope that the Government will take further steps to align this Bill with a fairer and greener future for everyone.

[David Mundell (Dumfriesshire, Clydesdale and Tweeddale) (Con)]

I will speak to Lords amendment 28, which was introduced in the other place but relates specifically to my constituency. The Eskdalemuir seismic array, which is near the village of Eskdalemuir in my constituency, is a seismological monitoring station established to detect seismic signals from nuclear explosions. To a generation that grew up following the end of the cold war, the facility may seem to be little more than a historical curiosity, but it continues to be a vital asset in global monitoring, in scientific research, and, crucially, in helping to keep the United Kingdom compliant with its international obligations under the comprehensive nuclear test ban treaty.

The Eskdalemuir seismic array has been operating since 1962, making it one of the longest-operating steerable seismic arrays in the world. The facility is geographically remote, in a low seismic noise environment, and highly calibrated and sensitive, enabling the detection of even small seismic signals at a vast distance. Over recent years, its seismometers have picked up the sonic boom from Russian jets in UK airspace, and have detected underground nuclear tests in North Korea. On one occasion, it was able to detect signals generated by the detonation of around 100 tonnes of conventional explosives in Kazakhstan. All that is clear evidence of the unique nature of the site and its capabilities.

Some might wonder what the site has to do with the Bill. What could the Bill’s impact be on the maintenance of this vital scientific facility, which is crucial to our national defence and our undertakings under international treaties? In many rural constituencies in Scotland, the march of large-scale wind farm developments continues, encouraged by the Scottish Government. The forces acting on wind turbines cause vibration in the turbine—vibrations that can travel underground for many kilometres, with obvious consequences for facilities that require seismological quiet for their effective operation.

As some Members may know, the desire of wind farm developers to push the boundaries of where their infrastructure can be located, and the boundaries of the guidance against which their applications are assessed, has led to challenges to the Ministry of Defence. A previous attempt by a developer to site a wind farm at Little Hartfell, which is in the consultation zone of the Eskdalemuir seismological monitoring station, led to judicial review proceedings against the MOD. On that occasion, the challenge did not dispute that the MOD is entitled to devise and enforce a policy to protect the array from interference with its detection capabilities—it concerned the way that proposed developments were prioritised—but the lesson is clear: developers will seek to push the boundaries of where and how their developments may be sited. Ministers must be aware of that, and willing to take measures to protect against that, where issues of national defence are at stake.

The key consideration is this: in a dangerous and difficult world, we must not water down our defence systems or let down our allies to squeeze out what, in a national context, is a small amount of extra electricity. The UK Government should robustly refuse to entertain novel technologies within the 15 km exclusion zone proposed by the Eskdalemuir working group, which would replace the existing 10 km zone. That should also apply to those applications already in the planning system that were submitted by developers who continued to pursue their projects aggressively, with full knowledge that work was ongoing to review the exclusion zone. Our national defence must come first. I am sure that most people would agree that this is an area where an abundance of caution is well justified. It would be concerning if Ministers and the MOD were pressured into going too far in the name of net zero.

I am not necessarily objective, because I am the Member of Parliament with the largest number of wind turbines in their constituency, either consented or built. I believe that industrial-scale wind farms are bad generally for the locality, but there need to be specific rules around them when national security is in question, and we have to protect our credibility with our international partners.

Any loosening of the rules on infrastructure developments around facilities like the Eskdalemuir seismic array, or passing up the opportunity to reinforce existing rules, would send entirely the wrong message, both to potential developers eager to exploit new opportunities to construct even more wind farms, and to our international partners, who rely on our ability to contribute to our own defence and our collective defence. Lords amendment 28 is an opportunity to underscore the protection needed for facilities like the Eskdalemuir seismic array, and I want this Government take those protections forward.