The photograph is dated 25th September 1903 and it is a 1903 20 HP Humber taking part in the 1,000 Mile Trial, driven by C Evinson. The car had the longest wheelbase (9ft) in the trials. The clues were that it had no registration plate which means it was pre-1904 as the Motor Car Act of 1903, which was not only for the licensing of drivers but also for the registration of vehicles, did come into effect until 1st Jan 1904. The first registration of A1 was secured by Earl Russell (the elder brother of Bertrand Russell) for his Napier just before Christmas 1903. The car also had a competition number and being a high number (122) meant that it was part of quite a large race/field which lead the researcher to the 1,000 Mile Trial which had 140 entries in 1903 (104 of which officially started on the first day). Third clue was the clothing which was early 1900s. It seems the photo may be the car leaving the city after a luncheon at the Guildhall. The Winchester stage was 133½ miles from Crystal Palace London and return. Technical details of car are: Humber, entered by Humber Ltd, Four cylinder engine bore and stroke 4½ in by 5 3/4 in, 20 hp Seats four Weight 21 cwt Price 787GBP 10 shillings Wheelbase 9 feet The engine size is 365.8 cubic inches or 5994 cc" Mark Dauber in New Zealand gave me a long list of links to sites interested in Humber! Automotive World Magazine - The Gateway: Humber World