Just a few comments
Barlows Garage (later Thomas Bros) Queen's Road - now a carpet warehouse
Hall's. Queen's Road - a couple of pumps which swung over the pavement - main garage at the rear now Craig y Don Travel.
Mostyn Garage/White's Engineers, Bodhyfryd Road - later Kwiks and a Market now demolished and flats on site.
Elsinore Garage, Somerset Street - pump was still here until a few years ago.
Meredith's, New Street. Later split into two - the other was Bilton's -now remodelled and is Home Front.
Vernon's, 5 Mostyn Street - mainly a showroom but may have had a swing pump.
Anyone remember Nev Bannister's small chain all named after family members ?