diff --git a/esphome/esp-centralstairs-bottom.yaml b/esphome/esp-centralstairs-bottom.yaml
index 3b8d493..0ec9d32 100644
--- a/esphome/esp-centralstairs-bottom.yaml
+++ b/esphome/esp-centralstairs-bottom.yaml
@@ -6,6 +6,7 @@
 # https://home.fox.co.nz/gitea/zorruno/zorruno-homeassistant/src/branch/master/esphome/esp-centralstairs-bottom.yaml
 #:########################################################################################:#
 # VERSIONS:
+# V3.8 2026-06-09 Added Downstairs Lights Bulk Activation virtual switch toggled by Button 1 double-click
 # V3.7 2025-09-24 Upload to this device
 # V3.5 2025-07-24 YAML tidyups
 #:########################################################################################:#
@@ -15,7 +16,8 @@
 #:########################################################################################:#
 # OPERATION NOTES:
 # - Light switch at bottom of the central stairs
-# - Button 1 toggles Relay 1 (Main Stair Lights - Lower) - physically connected
+# - Button 1 single-click toggles Relay 1 (Main Stair Lights - Lower) - physically connected
+# - Button 1 double-click toggles the Downstairs Lights Bulk Activation virtual switch for HA automations
 # - Button 2 controls Stair Footer Lights via MQTT (remote device), using Relay 2 as a local mirror state
 # - On MQTT connect, publishes current Relay 1 state to mqtt_status_topic_1 to keep remote status aligned
 #:########################################################################################:#
@@ -27,19 +29,27 @@
 # Remote device 2 (Stair Footer Lights):
 # - Command topic: ${mqtt_command_topic_2}  -> ON,OFF
 # - Status topic:  ${mqtt_status_topic_2}   -> ON,OFF
+#
+# HA virtual switch:
+# - Downstairs Lights Bulk Activation is exposed as a virtual switch for Home Assistant automations
+# - No custom MQTT command/status topic is defined for this virtual switch
 #:########################################################################################:#
 # OFFLINE NOTES:
 # a) Home Assistant OFFLINE, but Network and MQTT ONLINE
-#    - Physical buttons still operate (Relay 1 local toggle; Button 2 publishes MQTT for footer lights)
+#    - Button 1 single-click continues to toggle Relay 1 locally
+#    - Button 1 double-click still toggles the local virtual switch, but HA automations will not act until HA returns
+#    - Button 2 continues to publish MQTT commands for footer lights
 #    - Relay 1 state continues to be published to MQTT status topic
 #    - HA entities are unavailable until HA returns
 # b) MQTT OFFLINE (but WiFi/Network and HA API ONLINE)
 #    - Relay 1 still toggles locally and remains controllable from HA via API
+#    - Button 1 double-click can still toggle the virtual switch via HA API
 #    - Button 2 cannot control footer lights (MQTT publish fails)
 #    - Any MQTT state sync to remote devices will not occur while MQTT is down
 # c) Entire WiFi/Network OFFLINE
-#    - Physical button 1 continues to toggle Relay 1 locally (standalone)
-#    - Physical button 2 cannot control footer lights (no network transport)
+#    - Button 1 single-click continues to toggle Relay 1 locally (standalone)
+#    - Button 1 double-click can toggle the local virtual switch state, but HA will not see it until network returns
+#    - Button 2 cannot control footer lights (no network transport)
 #    - Timeclocks will drift without network (SNTP). Time of day can be reset by powering off then on again at 12pm (midday)
 #:########################################################################################:#
 
@@ -73,7 +83,7 @@ substitutions:
 
   # Project Naming
   project_name: "Zemismart Technologies.KS-811 Double" # Project Details
-  project_version: "v2.0" # Project V denotes release of yaml file, allowing checking of deployed vs latest version
+  project_version: "v2.1" # Project V denotes release of yaml file, allowing checking of deployed vs latest version
 
   # MQTT Controls
   mqtt_command_main_topic: !secret mqtt_command_main_topic
@@ -255,8 +265,25 @@ binary_sensor:
       - delayed_on: 30ms
       - delayed_off: 30ms
     name: "Button 1: ${switch_1_name}"
-    on_press:
-      - switch.toggle: Relay_1
+    on_multi_click:
+      # Double-click toggles a HA-visible virtual switch only. The double-click pattern is
+      # listed before the single-click pattern so a double-click does not also trigger the
+      # Relay 1 single-click action.
+      - timing:
+          - ON for at most 600ms
+          - OFF for at most 500ms
+          - ON for at most 600ms
+          - OFF for at least 150ms
+        then:
+          - switch.toggle: downstairs_lights_bulk_activation
+
+      # Single-click toggles the local Relay 1. This now waits for the click sequence to
+      # finish so it can distinguish a single-click from a double-click.
+      - timing:
+          - ON for at most 600ms
+          - OFF for at least 500ms
+        then:
+          - switch.toggle: Relay_1
 
   - platform: gpio
     pin:
@@ -288,6 +315,15 @@ binary_sensor:
 # https://esphome.io/components/switch/
 #:########################################################################################:#
 switch:
+  - platform: template
+    name: "Downstairs Lights Bulk Activation"
+    id: downstairs_lights_bulk_activation
+    icon: "mdi:lightbulb-group"
+    optimistic: true
+    restore_mode: ALWAYS_OFF
+    # HA automation helper only. Double-click Button 1 to toggle this switch on/off.
+    # It does not drive a relay directly and has no custom MQTT command/status topic.
+
   - platform: gpio
     name: "Relay 1: ${switch_1_name}"
     pin: GPIO13