Refresh provisional results in place

templates/results.html

@@ -262,8 +262,8 @@
       if (currentNrClass === 'walkon') return row.walkon;
       var sectionFares = ADVANCE_FARES && ADVANCE_FARES[row.section];
       var advFares = sectionFares && row.advance_key ? sectionFares[row.advance_key] : null;
-      if (!advFares) return null;
-      return currentNrClass === 'advance_std' ? advFares.advance_std : advFares.advance_1st;
+      if (!advFares) return row.walkon;
+      return (currentNrClass === 'advance_std' ? advFares.advance_std : advFares.advance_1st) || row.walkon;
     }
 
     function updateDisplay() {
@@ -342,6 +342,42 @@
       startTimetableRefresh();
     }
 
+    function runInsertedScripts(root) {
+      root.querySelectorAll('script').forEach(function(oldScript) {
+        var script = document.createElement('script');
+        for (var i = 0; i < oldScript.attributes.length; i++) {
+          var attr = oldScript.attributes[i];
+          script.setAttribute(attr.name, attr.value);
+        }
+        script.text = oldScript.text;
+        oldScript.parentNode.replaceChild(script, oldScript);
+      });
+    }
+
+    function fullResultsUrl() {
+      var url = new URL(window.location.href);
+      url.searchParams.set('render', 'full');
+      return url.toString();
+    }
+
+    function refreshFullResults() {
+      fetch(fullResultsUrl(), {headers: {'X-Requested-With': 'fetch'}})
+        .then(function(response) {
+          if (!response.ok) throw new Error('Could not refresh results');
+          return response.text();
+        })
+        .then(function(html) {
+          var doc = new DOMParser().parseFromString(html, 'text/html');
+          var nextMain = doc.querySelector('main');
+          var currentMain = document.querySelector('main');
+          if (!nextMain || !currentMain) throw new Error('Results page was incomplete');
+          document.title = doc.title;
+          currentMain.innerHTML = nextMain.innerHTML;
+          runInsertedScripts(currentMain);
+        })
+        .catch(function() {});
+    }
+
     function startTimetableRefresh() {
       if (!HAS_PROVISIONAL_TIMETABLE || !TIMETABLE_REFRESH_URL || !window.EventSource) return;
       var source = new EventSource(TIMETABLE_REFRESH_URL);
@@ -349,7 +385,7 @@
         var msg = JSON.parse(event.data);
         if (msg.type === 'reload') {
           source.close();
-          window.location.reload();
+          refreshFullResults();
         } else if (msg.type === 'eurostar_prices') {
           mergeEurostarPrices(msg.prices);
           updateDisplay();

tests/test_app.py

@@ -139,6 +139,8 @@ def test_results_can_render_from_weekday_timetable_cache(monkeypatch):
     assert 'ES 9014' in html
     assert 'checking exact timetable' in html
     assert '/api/results_refresh/BRI/paris/2026-06-22' in html
+    assert 'refreshFullResults()' in html
+    assert 'window.location.reload()' not in html
 
 
 def test_results_refresh_reloads_when_exact_timetable_differs(monkeypatch):

tests/test_playwright_return_fares.py

@@ -372,6 +372,75 @@ def test_single_advance_standard_premier_totals_on_initial_url(single_server):
         browser.close()
 
 
+def test_single_advance_first_falls_back_to_walkon_when_unavailable(monkeypatch):
+    monkeypatch.setattr(app_module, "get_cached", lambda key, ttl=None: None)
+    monkeypatch.setattr(app_module, "set_cached", lambda key, data: None)
+    monkeypatch.setattr(
+        app_module.rtt_scraper,
+        "fetch",
+        lambda travel_date, user_agent, station_crs="BRI": [
+            {"depart_bristol": "07:00", "arrive_paddington": "08:45", "headcode": "1A23"},
+        ],
+    )
+    monkeypatch.setattr(
+        app_module.gwr_fares_scraper,
+        "fetch",
+        lambda station_crs, travel_date: {
+            "07:00": {"ticket": "Anytime Day Single", "price": 138.70, "code": "SDS"},
+        },
+    )
+    advance_fares = {
+        "07:00": {
+            "advance_std": {"ticket": "Advance Single", "price": 50.0, "code": "ADV"},
+            "advance_1st": None,
+        },
+    }
+    monkeypatch.setattr(app_module.gwr_fares_scraper, "fetch_advance", lambda station_crs, travel_date: advance_fares)
+    monkeypatch.setattr(app_module.gwr_fares_scraper, "fetch_advance_streaming", lambda station_crs, travel_date: iter([advance_fares]))
+    monkeypatch.setattr(
+        app_module.eurostar_scraper,
+        "fetch",
+        lambda destination, travel_date: [
+            {
+                "depart_st_pancras": "10:01",
+                "arrive_destination": "13:34",
+                "destination": destination,
+                "train_number": "ES 9014",
+                "price": 59,
+                "seats": 42,
+                "plus_price": 89,
+                "plus_seats": 5,
+            },
+        ],
+    )
+    app_module.app.config["TESTING"] = True
+    server = make_server("127.0.0.1", 0, app_module.app)
+    thread = threading.Thread(target=server.serve_forever, daemon=True)
+    thread.start()
+    try:
+        with sync_playwright() as p:
+            browser = _launch_browser(p)
+            page = browser.new_page()
+            page.goto(
+                f"http://127.0.0.1:{server.server_port}"
+                "/results/BRI/paris/2026-07-20?nr_class=advance_1st&es_class=standard",
+                wait_until="domcontentloaded",
+            )
+
+            page.wait_for_function(
+                "Array.from(document.querySelectorAll('.total-price'))"
+                ".some(el => el.textContent.includes('£200.80'))",
+                timeout=10000,
+            )
+            totals = [el.inner_text() for el in page.locator(".total-price").all()]
+            assert totals == ["£200.80"]
+            assert "No NR fare" not in " ".join(totals)
+            browser.close()
+    finally:
+        server.shutdown()
+        thread.join(timeout=5)
+
+
 def test_return_advance_first_standard_premier_totals(local_server):
     with sync_playwright() as p:
         browser = _launch_browser(p)