London Underground Tours 2024. We will be running our exclusive hidden london tours at holborn from 31 july 2024. Millions of londoners pass through the central/piccadilly line station each day, but holborn:
Dig up the secrets of the past with hidden london tours and uncover the fascinating history that lies buried beneath the capital. Secrets of the london underground is inspired by our hidden london programme, which explores ‘forgotten’ parts of the tube network and goes behind the.