diff --git a/assets/js/app.js b/assets/js/app.js
index 1317086..abe4462 100644
--- a/assets/js/app.js
+++ b/assets/js/app.js
@@ -40,15 +40,22 @@ export function UTCIForecast() {
   // Each useState() pairs a value with a setter. Calling the setter
   // re-renders the page with the new value.
 
-  // The location we're forecasting for. Change the values below to set
-  // a different starting location for new visitors.
-  const [location, setLocation] = useState({
-    name: 'Pangbourne, Berkshire',
-    lat: 51.4839,
-    lon: -1.0725,
-    country: 'GB',
+  // The location we're forecasting for. Restored from localStorage if the
+  // user has visited before, otherwise defaults to Pangbourne, Berkshire.
+  const [location, setLocation] = useState(() => {
+    try {
+      const saved = localStorage.getItem('sunscope_last_location');
+      if (saved) return JSON.parse(saved);
+    } catch (e) { /* ignore */ }
+    return { name: 'Pangbourne, Berkshire', lat: 51.4839, lon: -1.0725, country: 'GB' };
   });
 
+  // Wrapper that persists the location before updating state.
+  const setLocationAndSave = (loc) => {
+    try { localStorage.setItem('sunscope_last_location', JSON.stringify(loc)); } catch (e) { /* ignore */ }
+    setLocation(loc);
+  };
+
   const [forecast, setForecast] = useState(null);     // raw Open-Meteo response
   const [loading, setLoading]   = useState(false);    // true while fetching
   const [error, setError]       = useState(null);     // fetch error message
@@ -750,7 +757,7 @@ export function UTCIForecast() {
                       key=${`${r.id}-${r.latitude}`}
                       class="utci-result"
                       onClick=${() => {
-                        setLocation({
+                        setLocationAndSave({
                           name: `${r.name}${r.admin1 ? ', ' + r.admin1 : ''}`,
                           lat: r.latitude,
                           lon: r.longitude,
diff --git a/assets/js/physics.js b/assets/js/physics.js
index 13a1d16..71ca283 100644
--- a/assets/js/physics.js
+++ b/assets/js/physics.js
@@ -308,6 +308,30 @@ export function calcVehicleInteriorTemp(Ta, globalRad, solElev, vehicleType = 'c
   return Math.max(Ta, Math.min(Ti, 90));
 }
 
+// ── FUTURE FEATURE: Vehicle-at-speed thermal model ────────────────────────────
+// Idea: extend calcVehicleInteriorTemp (or add a companion function) to model
+// cabin temperature for a vehicle travelling at speed, not just parked.
+//
+// Key physics differences from the static model:
+//   • Forced convection over the shell scales with vehicle speed (v²), so
+//     hOut rises significantly — shell cools much faster than when parked.
+//   • Above ~30 mph the vehicle's own forward motion dominates airflow, so
+//     ambient wind direction becomes largely irrelevant (simplifies the model).
+//   • Speed classes to model: urban (~20 mph), dual carriageway (~50 mph),
+//     motorway (~70 mph) — each with a derived hOut multiplier.
+//   • Windows-open behaviour changes completely at speed: at 70 mph open
+//     windows create high-velocity through-flow, dramatically cutting cabin
+//     temp vs. the sealed-car case (but much less pleasant than AC!).
+//   • Roof and bonnet solar gain stays the same; side-glass gain is unchanged.
+//   • AC-off vs AC-on would be the primary user toggle alongside speed class.
+//
+// Suggested signature:
+//   calcVehicleInteriorTempAtSpeed(Ta, globalRad, solElev, vehicleType, speedMph, windowsOpen)
+//
+// This would be a useful companion output column (e.g. "Vehicle (moving)")
+// for road-trip planning, dog-in-car safety at a rest stop vs. motorway, etc.
+// ─────────────────────────────────────────────────────────────────────────────
+
 // Vapour pressure (Magnus → hPa)
 export function vaporPressureHpa(Ta, RH) {
   const es = 6.105 * Math.exp((17.27 * Ta) / (237.7 + Ta));