Display 4-character National Trail shields

as well as shorter ones.

Author: Andy Townsend

resources/changelog_svwd01.md

@@ -2,6 +2,9 @@
 See also the [changelog](https://github.com/SomeoneElseOSM/SomeoneElse-vector-web-display/blob/main/changelog.md) for the scripts here.
 Except as noted, all changes also apply to the [SVWD06 Android native display style](https://github.com/SomeoneElseOSM/SomeoneElse-vector-web-display/blob/main/resources/README_svwd06.md).  
 
+## As yet unreleased
+Display 4-character National Trail shields as well as shorter ones.
+
 ## 13/03/2025
 Mud, scree, heath, scrube etc. are now shown at a wider range of zoom levels,
 

resources/svwd01_style.json

@@ -18555,11 +18555,12 @@
 	    "id": "label-shield-NT-15",
 	    "type": "symbol",
 	    "source-layer": "transportation",
-	    "filter": [ "all", [ "in", "class", "ldpnwn" ],
+	    "filter": [ "all", [ "in", "class", "ldpnwn",
+                                                "ldpnhn" ],
                                [ "has", "ref" ],
                                [ "in", "operator", "National Trails",
                                                    "Natural England" ],
-                               [ "<", "ref_len", 4 ] ],
+                               [ "<", "ref_len", 5 ] ],
 	    "layout": {
                 "icon-image": "shield_NT",
 		"icon-size": { "stops": [ [ 15, 1.0 ], 

resources/svwd06_style.json

@@ -18555,11 +18555,12 @@
 	    "id": "label-shield-NT-15",
 	    "type": "symbol",
 	    "source-layer": "transportation",
-	    "filter": [ "all", [ "in", "class", "ldpnwn" ],
+	    "filter": [ "all", [ "in", "class", "ldpnwn",
+                                                "ldpnhn" ],
                                [ "has", "ref" ],
                                [ "in", "operator", "National Trails",
                                                    "Natural England" ],
-                               [ "<", "ref_len", 4 ] ],
+                               [ "<", "ref_len", 5 ] ],
 	    "layout": {
                 "icon-image": "shield_NT",
 		"icon-size": { "stops": [ [ 15, 1.0 ],