News
New OS tideline data could strengthen coastal erosion and flood monitoring
NEW data released by Ordnance Survey (OS) could significantly improve how coastal erosion and flood risk are monitored across Great Britain as sea levels rise and extreme rainfall becomes more frequent.
The continuous tidelines dataset provides a clearer and more accurate picture of where high and low tides fall around the coast and along tidal rivers. The data is expected to support environmental monitoring, flood modelling, and long-term planning as the impacts of climate change accelerate.

Earlier this year, the Environment Agency updated its National Flood Risk Assessment (NaFRA), which for the first time factored in projected climate change impacts. The assessment found that around 6.3 million homes and businesses in England — roughly one in five — are currently at risk of flooding. That figure could rise to one in four properties by 2050.
The Agency has also updated its national coastal erosion risk map, which estimates that around 3,500 properties could be affected by coastal erosion by 2055.
The new OS dataset builds on existing information held in the OS National Geographic Database (OS NGD). Previously separate tidal boundary features have now been automatically merged into continuous high- and low-tide lines, creating two new feature types within the OS NGD Water theme. These can also be used as overlay layers through the OS Tiles API, allowing for clearer visual mapping and large-scale analysis.
The data is expected to support a wide range of environmental and regulatory work, including coastal erosion and flooding modelling, updating boundary features to reflect coastal change, climate change impact assessments, and identifying areas of foreshore that act as natural flood defences.
William Russell, Senior Coastal Process Scientist at the Wales Coastal Monitoring Centre, said the dataset would remove uncertainty from coastal monitoring.
“One of our core values is ‘data, not opinions’. When information is missing, we seek out or collect the data needed to support sound decision-making,” he said.
“The OS Continuous Tidal Boundaries dataset removes uncertainty from our strategic monitoring programme and gives us clearer insight into intertidal extents, delivering cost savings and efficiencies for our survey contractors.”
Ordnance Survey says the data is particularly valuable for environmental policy and regulation, including decisions around water discharge and flood management. Accurately defining the intertidal zone helps identify natural coastal defences, which play a vital role in protecting communities and ecosystems.
Intertidal information has also been enhanced within the Land theme of the OS NGD, with improved coverage of previously obscured areas to create a more complete national coastal dataset.
Lily Brown, Product Manager at Ordnance Survey, said the data would support evidence-based decision-making.
“The OS National Geographic Database contains trusted, accurate features that support everything from climate resilience and infrastructure planning to coastal management,” she said.
“By incorporating authoritative tideline data, we are enabling decisions that will help protect and monitor Britain’s evolving coastlines.”
Following the dataset’s release, Ordnance Survey analysed how ceremonial counties change in size between high and low tide. Merseyside showed the greatest variation, with a nearly 17% difference, followed by Orkney at around 7%.
The analysis also highlighted that counties considered landlocked, such as Nottinghamshire and South Yorkshire, still experience significant tidal influence due to rivers like the Trent and the Don being tidal far inland.
When combined with Unique Property Reference Numbers (UPRNs), the tideline data shows that Greater London has the highest number of homes and businesses within 15 metres of the high-tide line, at around 5,500. Cornwall ranks second with just over 3,000 properties, followed by Devon with around 2,400.
The new data has been released under the Public Sector Geospatial Agreement (PSGA), which provides emergency services and public sector organisations with access to Ordnance Survey data and services.
News
Recounts concern raised over new Senedd voting system
Political sources warn tiny vote differences could decide final seats under Wales’ new proportional voting system, with fears of inconsistent recount decisions across the country
QUESTIONS have been raised over how recounts will be handled in Wales’ first Senedd election using the new six-member proportional voting system, amid fears that tiny vote differences could decide the final seat in some constituencies.
Under the new arrangements, Wales has been divided into larger multi-member constituencies, with six Senedd Members elected in each area using the D’Hondt system of proportional representation.
Political sources have expressed concern that the current Electoral Commission guidance may not adequately address situations where the allocation of the sixth and final seat could hinge on very small differences in party vote totals.
One political source, who asked not to be named, said the issue was not about the competence or integrity of Returning Officers, but about the lack of detailed public guidance surrounding recount decisions under the new system.
They said: “In some constituencies, the final seat may come down to a very narrow margin once the D’Hondt calculations are applied, even if no party’s overall vote total appears especially close in traditional terms.
“The concern is that there appears to be no clear guidance about how close the contest for the final seat needs to be before a recount is granted.”
The source warned that without clearer guidance there could be inconsistencies across Wales, with recounts potentially being allowed in one constituency but refused in another despite similar margins.
Electoral Commission guidance currently states that Returning Officers must be satisfied vote totals are accurate before producing a provisional result and that candidates and agents are entitled to request recounts.
However, the guidance also makes clear that Returning Officers may refuse recount requests if they consider them “unreasonable”.
The Electoral Commission said the existing rules already provide a framework for openness and transparency during the counting process, with candidates and agents allowed to inspect ballot bundles and challenge provisional results before declarations are made.
The guidance also confirms that more than one recount can take place if Returning Officers believe further recount requests are justified.
But critics argue that Wales is entering untested territory with the new electoral system, where relatively small shifts in vote totals could alter the final seat allocation after D’Hondt calculations are completed.
The Senedd election is the first to use the new system, which replaces the previous arrangement of constituency and regional members with fully proportional six-member constituencies across Wales.
This story was first reported by Nation.Cymru, you can read their report here.
Charity
Chief’s Tour honours fallen officers with 75-mile Pembrokeshire ride
Dyfed-Powys Police team raises thousands for bereaved police families charity
A TEAM of officers and staff from Dyfed-Powys Police cycled 75 miles across west Wales on Wednesday (May 6) in memory of colleagues who lost their lives in the line of duty.
The annual “Chief’s Tour of Pembs 2026” saw participants travel from Fishguard to Carmarthen while raising money for the charity Care of Police Survivors, commonly known as COPS.
The force said the event raised £2,690, with funds going towards support for the families of police officers who have died while serving their communities.

Along the route, cyclists stopped at several locations to meet relatives of fallen officers and take part in moments of reflection.
In a statement shared on social media, the force said the tour was held “in memory of all Dyfed-Powys Police officers who have lost their lives in service.”
The post added: “Those we’ve lost will always remain in our thoughts.”
COPS supports the families of officers who have died on duty by organising national and regional events, helping survivors build support networks and friendships with others who have experienced similar loss.
Dyfed-Powys Police thanked members of the public who supported the cyclists during the challenge.
“A huge thank you to our community for showing our Chief’s Tour cyclists support as they passed through Pembrokeshire,” the force said.






“Your cheers, waves and encouragement kept spirits high for those taking part.”
The 75-mile challenge took riders across parts of north and west Pembrokeshire before continuing east towards Carmarthenshire, combining physical endurance with remembrance and fundraising.
Police charities such as COPS often work quietly behind the scenes, supporting bereaved families long after national attention fades following the death of an officer.
Education
Holocaust survivor’s story shared with pupils at Ysgol Greenhill
MORE than 150 pupils at Ysgol Greenhill have heard the moving Holocaust testimony of the late Zigi Shipper BEM, who survived some of the most terrible events of the Second World War.
The special visit took place on Tuesday (May 5), when Mrs Lu Lawrence came to the school to speak about the life of her father.
Zigi Shipper survived the Lodz ghetto, Auschwitz-Birkenau, Stutthof concentration camp and a death march, among other traumatic events. When he was liberated by British forces, he was just 15 years old.

Mrs Lawrence spoke to Key Stage 3 and GCSE pupils, sharing not only her father’s testimony but also her own family’s story.
Ysgol Greenhill said more than 150 students attended the session and were “exceptionally well behaved”, asking thoughtful questions during the visit.
The school said: “In the current climate of increasing anti-Semitism, understanding the dangers of prejudice is more important than ever.”
The visit was arranged by the Holocaust Educational Trust, which works with schools to ensure young people continue to learn about the Holocaust and the dangers of hatred and discrimination.
The session gave pupils an opportunity to hear a deeply personal account of survival, loss and resilience, and to reflect on why Holocaust education remains so important today.
Photo caption:
Important lesson: Mrs Lu Lawrence visited Ysgol Greenhill to share the Holocaust testimony of her late father Zigi Shipper BEM (Pic: Ysgol Greenhill).
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