Apparently it's the offices of a shopfitters. According to the listing, which is so laden with architectural words I found it quite heavy to copy from Historic England's website:
Zion House and attached railings and gateways. Congregational chapel, now offices. 1830. For John Hare. Pennant stone rubble and limestone ashlar, slate roof. Open plan. Classical style. 2 storeys and basement; 5-window range. Portico of tetrastyle-in-antis cast-iron Tuscan columns, with a deep entablature returning at the ends; the pediment contains a louvred oculus supported by a wide blank panel with relief palmettes
Apparently the antae are the bits supporting the sides of the entranceway, and stylos is a column, so the supporting ends with the four columns in between are a tetrastyle-in-antis. I will now forget that before it appears in a Times cryptic.
I'm fairly sure I saw Louvred Oculus playing a gig at the Louisiana once.
GPS Coordinates:
51.44548, -2.59211
Location: Bedminster East
