Two dates to visit two underground sites in Bristol

Fancy a day outside London seeing an underground railway and an underground vault on the same day?
If yes, then the Clifton suspension bridge in Bristol is having a number of hard-hat tours of its recently discovered vaults, and by fortunate coincidence, two of the dates sync with tours of the nearby underground funicular railway.The dates to book tickets for the Clifton suspension bridge tours are either Sunday 14th April at 12 noon, or Saturday 11th May at 10:30am.
On the same day, the nearby