https://apps.nationalmap.gov/3depdem/
I've used it to map old quarries and other sites in my area.
New Hampshire has an ongoing project to map stone walls using lidar: http://www.granit.unh.edu/resourcelibrary/specialtopics/ston...
Or was it just a fun thing you were playing around with on a hidden page?
From viewing your map, it seems ~ 70% of England is covered at 1m resolution. Is the other 30% covered by different resolutions or are there some areas not covered at all? Any idea what the Environment Agency's thinking is? (e.g. some areas hit by 2015 Boxing Day floods are not covered at 1m).
(I'm maybe interested in using their data, depending on what the coverage is). Thanks.
Not sure how it differs/overlaps with the National Map viewer.
A commenter above you posted a link to a NOAA data site. I believe that site is a resource for GIS shapefiles: https://coast.noaa.gov/inventory/