European Geostationary Navigation Overlay Service

Lord Davies of Gower Excerpts

Thursday 12th June 2025 Grand Committee

[Lord Davies of Gower (Con)]

My Lords, it is a great pleasure to follow the noble Lord, Lord Lansley, and learn of his interest in satellites. I thank the noble Lord, Lord Berkeley, for—and, indeed, congratulate him on—gaining time for this debate, as well as for his relentless work in pursuing the issue of EGNOS. I declare my interests as the vice-president of the Aircraft Owners and Pilots Association UK and as the chair of the All-Party Parliamentary Group for Aviation; I am an aviator and have particular interest in this matter. Much of what I want to say has already been referred to by the noble Lord, Lord Berkeley, but I hope to add some detail to it. I come to this from a general aviation perspective.

The European Geostationary Navigation Overlay Service, commonly referred to as EGNOS, is designed to improve the integrity and precision of GPS services. To give it its correct title, it is the EGNOS Safety of Life Service. Those three words—safety of life—are particularly important and significant. In the world of aviation, EGNOS enables users of GPS services to be confident that the information being supplied to them is accurate and precise. It is used when operating into airfields in inclement weather conditions; examples of this include when descending through cloud, foggy or misty conditions. Descending through cloud and relying on the EGNOS system allows the aircraft and the pilot to arrive blindly but safely at the end of the runway. This is of use not only to aviation but to the maritime sector, in avoiding obstacles or perhaps entering a port in fogged-out conditions.

Sadly, as a result of our exiting the European Union, the UK’s participation in the EGNOS programme ended on 25 June 2021. Despite the hundreds of millions of pounds that the UK contributed to the Galileo satellite system, this led to a withdrawal of legal indemnity for the use of EGNOS; it therefore cannot be safely and fully utilised by aircraft any longer. Although the signal remains in place, reliance on it that might end in an accident would undoubtedly invalidate the aircraft’s insurance. The upshot of this is that UK aircraft operators cannot use EGNOS Safety of Life any longer; of course, this extends to all other users, such as agriculture, surveying and maritime, but it particularly affects aviation, which has additional inherent risks.

Perhaps it would be helpful at this point for me to explain that large airports have a sophisticated and expensive-to-maintain instrument landing system, commonly referred to as ILS. This uses two directional radio signals: the localiser, which provides horizontal guidance, and the glideslope, which provides vertical guidance. These signals are ground-generated by radio signals or, in some cases, microwave signals. EGNOS, on the other hand, is Europe’s regional satellite-based augmentation system. It is used primarily by smaller airports as it can be utilised at a vastly reduced cost; the onboard aircraft equipment necessary for its operation is, in the grand scheme of things, relatively cheap to install and operate.

The Brexit negotiations removed Britain’s access to EGNOS, not because of technical necessity but because EGNOS is managed under EU governance structures. Post Brexit, Britain became a third country. Unless specific agreements were made, access ceased. Maintaining EGNOS access would have required around £30 million to £35 million a year—trivial compared to the economic damage of degraded aviation connectivity—but we did not retain access.

In 2022, the APPG for Aviation commissioned a report arguing for the reinstatement of the EGNOS system. An excellent report by Oxera in Oxford also convincingly argued the case for continuing the service; I thoroughly recommend its reading to the Minister. Oxera argues the case for EGNOS for several reasons. First, it enables precision farming, which improves the efficiency of field working, fertiliser and pesticide use; this leads to higher crop yields and lower costs. Secondly, it improves safety and efficiency in the maritime sector, supporting UK trade. Thirdly, it provides greater resilience at airports when, for example, ground systems fail. Fourthly, it provides more reliable services, including aviation approaches, to the Scottish islands and the Isles of Scilly, where there is no other option but to travel by air in winter.

There is also improved flight safety—EGNOS reduces controlled flight into terrain, one of the CAA’s “significant seven” risks, by a factor of four to eight—and improved reliability of search and rescue and helicopter emergency services. EGNOS enables point-to-point technology, allowing helicopters to operate in poor weather. The CAA has stated that a number of HEMS and SAR operations have experienced accidents and incidents due to poor visibility, and EGNOS was required to reduce these risks. There is also improved access to essential services; with EGNOS, those living on UK islands with poorer access to NHS hospitals will miss fewer appointments every year, which tend to be for urgent treatment or diagnosis. The case for EGNOS is overwhelming.

I understand that the current position of the Department for Science, Innovation and Technology is that the Government are considering options for UK access to a satellite-based augmentation system following its withdrawal from EGNOS and that

“work is ongoing and no decision has yet been made”.

That is to be applauded, but meanwhile this life-saving facility has ceased to function and places those who rely on it at risk—all for the sake of a sum of money, which, in the grand scheme of things, is peanuts when compared to the lives at stake. Does the Minister agree that development of a new system will be years in the making and that, as an interim measure, access to EGNOS would be a positive and sensible way forward? What of the Civil Aviation Authority, the UK’s aviation regulator, whose core work revolves around safety? What representations has his department had from it on the potential dangers to aviation due to the disappearance of EGNOS?

Martin Robinson, the chief executive officer of the Aircraft Owners and Pilots Association UK said in a recent article:

“Britain’s aviation future depends on confronting political vanity and embracing real-world cooperation … Restoring access to EGNOS is not just an operational necessity. It is a test of leadership. We rejoined European programmes such as Horizon 2020 … because it was the right thing to do without any political concerns. So why not EGNOS”.


We must act now to restore what is an essential life-saving service to the many sectors that it previously served, in particular aviation. I look forward to the Minister’s response.

--- Later in debate ---

[Lord Hendy of Richmond Hill (Lab)]

I thank my noble friend for that question. It is a good question because developments in drones, particularly drones beyond line of sight, uncrewed aircraft and flying taxis have been much in the news recently. There are many applications way beyond traditional air applications. There is activity for drones beyond line of sight not only on the railway but in better policing. Those things would affect a judgment about an investment in this and whether the continuing cost of it is worth investing in. I urge my noble friend not to ask us to be too peremptory in making a once-and-for-all decision when technology is changing as, because of that, the justification for doing this might increase and we might get to the answer that my noble friend wants.

I am grateful to all noble Lords for their thoughtful and constructive contributions, which reflect the strong interest in maintaining the UK’s continued leadership in aviation safety and innovation. We remain committed to ensuring safety and efficiency. We recognise the real value of systems such as EGNOS, but we must also consider the financial implications and seek solutions that offer the best value for money.

On the contributions of noble Lords about the cost of it, or the cost when it was around £35 million—I cannot confirm whether that might be the current cost or not—if the previous Government could not justify it, in these difficult financial circumstances we have a duty to justify public expenditure. However, noble Lords will have heard me say that we are considering it not only for the benefits from EGNOS for the purposes described in the discussion today but because the future of drone and uncrewed aircraft technology is rapidly developing. I hope noble Lords will appreciate that we are strongly considering it. I am grateful for all that they have said.

[Lord Davies of Gower (Con)]

My Lords, I am very grateful for the Minister’s response, but what representation has the department had from the CAA on this issue?

[Lord Hendy of Richmond Hill (Lab)]

The department is in constant discussion with the CAA on this issue. I do not have any evidence that the CAA believes that reimplementing EGNOS is a matter of the greatest concern, but as the noble Lord asked the question, I will go away, find out what the current position with the CAA is and write to him about it.