diff --git a/homeassistant/components/uk_transport/sensor.py b/homeassistant/components/uk_transport/sensor.py
index b06d0e24891..594d46c74ab 100644
--- a/homeassistant/components/uk_transport/sensor.py
+++ b/homeassistant/components/uk_transport/sensor.py
@@ -32,6 +32,7 @@ ATTR_NEXT_BUSES = "next_buses"
 ATTR_STATION_CODE = "station_code"
 ATTR_CALLING_AT = "calling_at"
 ATTR_NEXT_TRAINS = "next_trains"
+ATTR_LAST_UPDATED = "last_updated"
 
 CONF_API_APP_KEY = "app_key"
 CONF_API_APP_ID = "app_id"
@@ -199,7 +200,9 @@ class UkTransportLiveBusTimeSensor(UkTransportSensor):
     def extra_state_attributes(self) -> dict[str, Any] | None:
         """Return other details about the sensor state."""
         if self._data is not None:
-            attrs = {ATTR_NEXT_BUSES: self._next_buses}
+            attrs = {
+                ATTR_NEXT_BUSES: self._next_buses,
+            }
             for key in (
                 ATTR_ATCOCODE,
                 ATTR_LOCALITY,
@@ -272,6 +275,7 @@ class UkTransportLiveTrainTimeSensor(UkTransportSensor):
             attrs = {
                 ATTR_STATION_CODE: self._station_code,
                 ATTR_CALLING_AT: self._calling_at,
+                ATTR_LAST_UPDATED: self._data[ATTR_REQUEST_TIME],
             }
             if self._next_trains:
                 attrs[ATTR_NEXT_TRAINS] = self._next_trains
diff --git a/tests/components/uk_transport/test_sensor.py b/tests/components/uk_transport/test_sensor.py
index a4a9aea18c8..ba547c5eecc 100644
--- a/tests/components/uk_transport/test_sensor.py
+++ b/tests/components/uk_transport/test_sensor.py
@@ -8,6 +8,7 @@ import requests_mock
 from homeassistant.components.uk_transport.sensor import (
     ATTR_ATCOCODE,
     ATTR_CALLING_AT,
+    ATTR_LAST_UPDATED,
     ATTR_LOCALITY,
     ATTR_NEXT_BUSES,
     ATTR_NEXT_TRAINS,
@@ -90,3 +91,4 @@ async def test_train(hass: HomeAssistant) -> None:
         == "London Waterloo"
     )
     assert train_state.attributes[ATTR_NEXT_TRAINS][0]["estimated"] == "06:13"
+    assert train_state.attributes[ATTR_LAST_UPDATED] == "2017-07-10T06:10:05+01:00"