This message is only visible to admins:
Problem displaying Facebook posts. Backup cache in use.
Error: Error validating access token: The session has been invalidated because the user changed their password or Facebook has changed the session for security reasons.
Type: OAuthException
Click here to Troubleshoot.
Type: OAuthException
Click here to Troubleshoot.
What does the museum have in the way of telecommunications and Post Office heritage?
The museum has three exchange buildings complete with the rotary exchanges in them as well as manual operators desks in the main museum building and a crossbar exchange.
