The Roman/Greek style frontage hides a photo lab. Next door is a fish and chip shop.
The columns here are not roman. Noel Morley told me by email that they are Victorian cast iron and were the entrance to the old fish market. The fish came in from Whitstable by train and it was in the early days quite a success. There were iron railings between the two outer pillars leaving the centre open.
He also found a link to the British Pathé Library film snippet which shows this - click here.