SIES Tile Cache
CORS-enabled web server
https://tilecache.kmi.open.ac.uk/osm/b/tms/osmfr/{z}/{x}/{y}.png
https://tilecache.kmi.open.ac.uk/osm/b/tms/hot/{z}/{x}/{y}.png
https://tilecache.kmi.open.ac.uk/osm/c/tms/empty/{z}/{x}/{y}.png
https://tilecache.kmi.open.ac.uk/osm/a/tms/light_all/{z}/{x}/{y}.png
https://tilecache.kmi.open.ac.uk/osm/a/tms/dark_all/{z}/{x}/{y}.png