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Cave surveying useful information.

Starting with a list and we will see how it goes

Geospatial information

LIDAR for England and Wales, plus old maps of UK

https://www.archiuk.com

The LIDAR appears to come from the Environment Agency, possibly

https://environment.data.gov.uk/dataset/9ba4d5ac-d596-445a-9056-dae3ddec0178

Which also do some 25cm and 50 cm stuff (but currently the link through is broken)

eg https://www.data.gov.uk/search?q=DTM+25cm&filters%5Bpublisher%5D=&filters%5Btopic%5D=&filters%5Bformat%5D=&sort=best

BGS WMS information

https://www.bgs.ac.uk/technologies/web-map-services-wms/