Could anyone put a date to this? Pre 1915 due to attire and lack of buses?

A Southdown Kiosk for booking and enquiries had been opened on the 11/11/1915 , (after incorporation 2/6/1915), in Maderia Walk facing the Palace Pier being beside the Aquarium, where a waiting room was added in April 1921, with early attempts to form a bus/coach station in 1922. This was not to be and by courtesy of Brighton Corporation, a station was formed with a company office in the triangle called 'Pool Valley'.  All public parking was banned, bays were marked for stage-carriage services on two side of this triangle, becoming the central terminus for Brighton destined 'Southdown Motor Services' buses. In 1962 it escaped becoming a car park, and since has become a coach termini, and operated by various coach company 'tenants', with express services & for long distance Stagecoach bus services.
Credits for references go to C. Morris.

I think that the photograph will probably date from between 1908 and 1921. Above the Cowley name on 'Ye Olde Bunn Shoppe' are the Royal Arms. Caroline Cowley, the daughter of my great, great grandfather, Francis Cowley, was granted a Royal Warrant in 1908 and she joined the Royal Warrant Holders Association on 10th October of that year. Following the death of King Edward VII in 1910, Caroline was granted permission in 1912 to continue using the Royal Arms. She resigned her membership of the Association on 5th October 1921 when the dispensation came to an end. There is more information on my Cowley family history web site at www.cowleyfamily.org.uk.