Dates announced to walk through the Mail Rail tunnels

The Postal Museum has announced fresh dates for the chance to walk through old Mail Rail tunnels, including a special part not usually included for their festive walks.
(c) The Postal Museum
Visitors can explore parts of London’s 100-year-old postal railway that aren’t accessible on the Mail Rail ride by accessing the original tunnels, tracks, and station platforms.
You will be in the tunnels for approximately 1 hour and 15mins.
The route involves walking on uneven ground in low-ligh