diff --git a/Config/App-Info.plist b/Config/App-Info.plist
index 893d1b5..a5269bf 100644
--- a/Config/App-Info.plist
+++ b/Config/App-Info.plist
@@ -26,6 +26,8 @@
 	<string>FuelBoard uses your location to find the cheapest nearby petrol stations.</string>
 	<key>NSLocationAlwaysAndWhenInUseUsageDescription</key>
 	<string>FuelBoard uses Always location to alert you when you approach the cheapest station nearby.</string>
+	<key>NSLocalNetworkUsageDescription</key>
+	<string>FuelBoard connects to the FuelBoard Relay on your local network to download the latest fuel prices.</string>
 	<key>UIBackgroundModes</key>
 	<array>
 		<string>location</string>
diff --git a/FuelBoard/ContentView.swift b/FuelBoard/ContentView.swift
index 6d157a5..9dd84d5 100644
--- a/FuelBoard/ContentView.swift
+++ b/FuelBoard/ContentView.swift
@@ -165,28 +165,40 @@ struct ContentView: View {
         }
         .onAppear {
             // Onboarding runs first on a fresh install — it owns the initial
-            // permission prompts. Location tracking starts once it's done.
+            // permission prompts (location, notifications, and the data/local
+            // network probe on the Data page). Location tracking and the first
+            // network fetch start once it's done.
             if FuelStore.loadHasCompletedOnboarding() {
                 locationManager.startForegroundTracking()
+                monitor.update(stations: stations, favourites: refreshedFavourites,
+                               fuel: alertsFuel, radiusKM: alertsRadius)
+                monitor.setEnabled(alertsEnabled)
+                // Refresh only when the cache is stale (twice-a-day policy).
+                Task { await refresh() }
             } else {
                 showOnboarding = true
             }
-            monitor.update(stations: stations, favourites: refreshedFavourites,
-                           fuel: alertsFuel, radiusKM: alertsRadius)
-            monitor.setEnabled(alertsEnabled)
-            // Refresh only when the cache is stale (twice-a-day policy).
-            Task { await refresh() }
         }
         .onChange(of: showOnboarding) { _, showing in
             // After onboarding finishes (or the test re-run is dismissed),
-            // begin foreground location tracking if permission allows.
+            // begin foreground location tracking if permission allows, and
+            // run the first data fetch (the relay probe during onboarding
+            // already surfaced the Local Network prompt).
             if !showing, FuelStore.loadHasCompletedOnboarding() {
                 locationManager.startForegroundTracking()
+                monitor.update(stations: stations, favourites: refreshedFavourites,
+                               fuel: alertsFuel, radiusKM: alertsRadius)
+                Task { await refresh() }
             }
         }
         .onChange(of: scenePhase) { _, newPhase in
             if newPhase == .active {
-                locationManager.startForegroundTracking()
+                // Never start location tracking while onboarding is on screen —
+                // onboarding owns the initial permission prompts. Once it's
+                // completed, normal foreground tracking resumes.
+                if !showOnboarding, FuelStore.loadHasCompletedOnboarding() {
+                    locationManager.startForegroundTracking()
+                }
                 monitor.update(stations: stations, favourites: refreshedFavourites,
                                fuel: alertsFuel, radiusKM: alertsRadius)
                 // No network fetch on foreground — pull-to-refresh is the override.
diff --git a/FuelBoard/OnboardingView.swift b/FuelBoard/OnboardingView.swift
index e2dc867..4d6696e 100644
--- a/FuelBoard/OnboardingView.swift
+++ b/FuelBoard/OnboardingView.swift
@@ -3,10 +3,10 @@ import CoreLocation
 import UserNotifications
 
 /// First-launch onboarding: introduces FuelBoard, then walks the user through
-/// the two system permissions (location + notifications) with in-context
-/// prompts. In production it appears once at initial launch (driven by
-/// `FuelStore.loadHasCompletedOnboarding()`); a test button in the Alerts tab
-/// re-opens it anytime.
+/// the three system permissions (location, notifications, local network for
+/// data loading) with in-context prompts. In production it appears once at
+/// initial launch (driven by `FuelStore.loadHasCompletedOnboarding()`); a
+/// test button in the Alerts tab re-opens it anytime.
 struct OnboardingView: View {
     var onFinish: () -> Void
 
@@ -14,7 +14,7 @@ struct OnboardingView: View {
     @StateObject private var prompter = OnboardingPermissionPrompter()
     @State private var page = 0
 
-    private let totalPages = 4
+    private let totalPages = 5
 
     var body: some View {
         VStack(spacing: 0) {
@@ -45,13 +45,15 @@ struct OnboardingView: View {
                 welcomePage.tag(0)
                 locationPage.tag(1)
                 notificationsPage.tag(2)
-                donePage.tag(3)
+                dataPage.tag(3)
+                donePage.tag(4)
             }
             .tabViewStyle(.page(indexDisplayMode: .never))
             .onChange(of: page) { _, newPage in
                 // Trigger each system prompt the moment its page appears.
                 if newPage == 1 { prompter.requestLocation() }
                 if newPage == 2 { prompter.requestNotifications() }
+                if newPage == 3 { prompter.requestDataAccess() }
             }
 
             bottomAction
@@ -168,6 +170,59 @@ struct OnboardingView: View {
         }
     }
 
+    private var dataPage: some View {
+        VStack(spacing: 0) {
+            Spacer()
+            ZStack {
+                Circle().fill(Color.teal.opacity(0.12)).frame(width: 96, height: 96)
+                Image(systemName: "arrow.down.circle.fill")
+                    .font(.system(size: 40, weight: .semibold))
+                    .foregroundStyle(.teal)
+            }
+            .padding(.bottom, 28)
+
+            Text("Prices, ready when you are")
+                .font(.largeTitle.bold())
+
+            Text("FuelBoard downloads the latest prices from a relay on your local network — the full UK dataset, refreshed twice a day. Local network access is needed for that first download.")
+                .font(.body)
+                .foregroundStyle(.secondary)
+                .multilineTextAlignment(.center)
+                .padding(.horizontal, 32)
+                .padding(.top, 12)
+
+            dataStatusLabel
+                .padding(.top, 24)
+
+            Spacer()
+        }
+    }
+
+    @ViewBuilder
+    private var dataStatusLabel: some View {
+        if prompter.dataLoading {
+            VStack(spacing: 10) {
+                ProgressView()
+                Text("Checking the FuelBoard Relay…")
+                    .font(.footnote)
+                    .foregroundStyle(.secondary)
+            }
+        } else if prompter.dataGranted {
+            Label("Connected — prices will load", systemImage: "checkmark.circle.fill")
+                .foregroundStyle(.green)
+        } else if prompter.dataDenied {
+            Text("Local network access was denied — prices won't load until it's allowed. You can open Settings to change this.")
+                .font(.footnote)
+                .foregroundStyle(.secondary)
+                .multilineTextAlignment(.center)
+                .padding(.horizontal, 32)
+        } else {
+            Text("The system prompt will appear next.")
+                .font(.footnote)
+                .foregroundStyle(.secondary)
+        }
+    }
+
     private var donePage: some View {
         VStack(spacing: 0) {
             Spacer()
@@ -224,6 +279,24 @@ struct OnboardingView: View {
                     if prompter.notificationsGranted { page = 3 }
                 }
             }
+        case 3:
+            VStack(spacing: 10) {
+                primaryButton(
+                    prompter.dataDenied ? "Open Settings" : (prompter.dataGranted ? "Continue" : (prompter.dataLoading ? "Checking…" : "Continue"))
+                ) {
+                    if prompter.dataDenied {
+                        openSettings()
+                    } else if prompter.dataGranted || !prompter.dataLoading {
+                        page = 4
+                    }
+                }
+                .disabled(prompter.dataLoading)
+                if prompter.dataDenied {
+                    Button("Check again") { prompter.requestDataAccess() }
+                        .font(.subheadline)
+                        .foregroundStyle(.secondary)
+                }
+            }
         default:
             primaryButton("Start Using FuelBoard") { finish() }
         }
@@ -285,7 +358,7 @@ struct OnboardingView: View {
     }
 }
 
-/// Owns the two system permission requests during onboarding and publishes
+/// Owns the system permission requests during onboarding and publishes
 /// their outcomes so the pages can reflect them live.
 @MainActor
 final class OnboardingPermissionPrompter: NSObject, ObservableObject, @preconcurrency CLLocationManagerDelegate {
@@ -293,6 +366,9 @@ final class OnboardingPermissionPrompter: NSObject, ObservableObject, @preconcur
     @Published private(set) var locationDenied = false
     @Published private(set) var notificationsGranted = false
     @Published private(set) var notificationsDenied = false
+    @Published private(set) var dataGranted = false
+    @Published private(set) var dataDenied = false
+    @Published private(set) var dataLoading = false
 
     private let manager = CLLocationManager()
 
@@ -334,6 +410,44 @@ final class OnboardingPermissionPrompter: NSObject, ObservableObject, @preconcur
         }
     }
 
+    /// Probes the FuelBoard Relay. The first connection to a local-network
+    /// address is what makes iOS show the Local Network permission prompt —
+    /// so this both triggers the prompt in context and verifies data will
+    /// actually load. A small request (limit 1) is enough; the full download
+    /// happens after onboarding completes.
+    func requestDataAccess() {
+        guard !dataLoading else { return }
+        dataLoading = true
+        dataDenied = false
+        Task {
+            var ok = false
+            defer {
+                dataLoading = false
+                dataGranted = ok
+                dataDenied = !ok
+            }
+            do {
+                var components = URLComponents(
+                    url: RelayFuelProvider().baseURL.appendingPathComponent("api/v1/stations"),
+                    resolvingAgainstBaseURL: false
+                )!
+                components.queryItems = [
+                    URLQueryItem(name: "fuel", value: FuelType.e10.rawValue),
+                    URLQueryItem(name: "limit", value: "1"),
+                ]
+                var request = URLRequest(url: components.url!)
+                request.timeoutInterval = 8
+                let (_, response) = try await URLSession.shared.data(for: request)
+                guard let http = response as? HTTPURLResponse, http.statusCode == 200 else {
+                    throw FuelProviderError.relayUnavailable
+                }
+                ok = true
+            } catch {
+                ok = false
+            }
+        }
+    }
+
     nonisolated func locationManagerDidChangeAuthorization(_ manager: CLLocationManager) {
         Task { @MainActor in
             self.refreshLocationStatus()