WIP:: Initial stab at regions demo for Europe.

Change-Id: I80402aea2b3d57bf104db0c0fba68bebda0cae9e
diff --git a/tools/test/topos/uk-region.json b/tools/test/topos/uk-region.json
index 7b42fa7..2f52e7d 100644
--- a/tools/test/topos/uk-region.json
+++ b/tools/test/topos/uk-region.json
@@ -63,7 +63,7 @@
   },
 
   "layouts": {
-    "_default_": {
+    "root": {
       "basic": {
         "geomap": "uk",
         "scale": 1.2,