This is a hotel, which means that the bar is only open to residents.
Large historic mansion house hotel, dating from 1790, located very close to the sea front. It is a popular venue for functions and events, such as weddings and funerals. There is a large conservatory dining area at the rear, plus a couple of other large function/dining rooms.
Although the hotel will usually serve the passing general public from its small bar, which is centrally located on the ground floor behind the reception area. If it is busy with functions, then it may have to refuse entry.
Norton House Hotel, Mumbles