Restaurant for the Chapel Royal?

Following its restoration earlier this year, the Chapel Royal, on the corner of North Street and Princes Place, may get an 80 covers restaurant in a "unique cavern venue", i.e.  the undercroft or vaults of the church. These have no internal connection to the church and have been under separate freehold title from the chapel since 1896. Planning application BH2012/03647 details alterations to the entrance shown above to provide access to the vaults and necessary internal works.

The plans require excavating a basement area from the public highway in front of the door and providing a flight of steps and a disabled lift. This area will be surrounded by cast iron railings and its walls faced with bricks matching those of the Chapel Royal.