Dovorian Coaching Co - It would seem that the Dovorian Coaching Co evolved by Mr Jack Williams, a well known tonsorial & tobacconist in the Market Square, he was honorary organiser for Dover United supporters club, and in 1920 provided a booking service for transport to the matches from his premises in the Market Square.
In 1922, a partnership between Frank Delahaye and Jack Williams formed the Dovorian Coaching Company using the premises at the Market Square, as well as Jacks original business.
I do not know the exact position of this site, nor do I know if buses were kept/garaged there, but I do know that East Kent Road Car Company had an office 22 Market Square..... could it be the same site?
In 1924 the Businesses moved to 1 Bench Street
31 December 1920 (DE) - the first notice that shows Williams of Market Square , as supplying a booking service for Dover United football supporters.
11 April 1924 9DE) - Advert note the phone 165
27 June 1924 (DE) - as seen in this advert, Dovorian Coaching co is moving to 1 Bench Street