The data is presented in OSGB coords and is free to use and distribute. Contours were derived from 90m SRTM data that was cleaned and had holes patched. The contours were created in ArcMap at 25m intervals. The data does not include the Shetland Islands as SRTM data becomes unreliable at 60N. The cell size is close to 90m. Contours were derived from Level one 90m SRTM data. SRTM data was cleaned and holes were filled. Contours were created in ESRI ArcGIS. SRTM data was collected by NASA in February 2000. GIS vector data. This dataset was first accessioned in the EDINA ShareGeo Open repository on 2010-10-29 and migrated to Edinburgh DataShare on 2017-02-21.ESRI Shapefile