Harry "Slugger" Upwright is the son of Big Jim "Still Standing"" Upwright and twin brother of Little Jim "Leadpipe" Upwright. After the collapse of the Ankh-Morpork Post Office, its mail coaches continued to be operated independently by their drivers. Big Jim Upwright bought out the other operators with winnings from a bare knuckle fight and his sons continue the business, now carrying the Royal Mail again as well as passengers.
A brief experiment with coach advertising.
No trace of the driver, passengers or horses was ever found.