2hats
Dust.
Somewhat wandering off thread so I've buried it in here...I believe the Met Office is closing sites rather than opening more maybe 2hats can confirm this.
Hand waving attempt at trying to get a feel for how the number of UK land surface observation stations have changed over the years. As mentioned above this could include a lot of transient ones, eg for construction projects, or even ones for the early planning stages of projects that ultimately never came to fruition, plus dedicated stations measuring temperature for some very specific application and perhaps not a "true" fully WMO compliant weather station. This is the variation in numbers of temperature recording stations over the years (1853-2020) from just one dataset so might not be entirely representative.