A sign that says: "Wi-Fi data collection TfL collects Wi-Fi connection data at some stations the Elizabeth line to better understand journey patterns and improve TfL services. TfL will not identify individuals. You can opt out by turning off your device's Wi-Fi. For more information visit tfl.gov.uk/wifi-data-collection"
https://assets.octodon.social/media_attachments/files/109/718/199/786/432/065/original/e3b0226ac4931020.jpeg