Similar to the neighbouring Theatre Royal, the Playhouse also has two FHRS identifiers.  I stopped into the ticket office to ask about on-site eateries, and The Boards is part of the Playhouse building in an upstairs area -- I think this is therefore the non-bar-related FHRS ID of the two.  There is a separate bar in the main building from the main entrance, and I think that that must be the FHRS ID for the eatery with the word bar in the name.