I use JOSM as an editor and have had some success adding a LIDAR Composite DTM 2022 Imagery 1m layer for England using a environment.data.gov.uk source. However I’m unable to get anything working using the Welsh DataMapWales website. They do have a DTM 2m layer that would do the job, but WSM sources don’t appear to work with JOSM. Any Welsh editors figured out how to access good qualify LiDAR imagery?