Quote: DaButt @ January 13 2012, 6:01 PM GMTThey don't have vehicles?
In London, the postmen often travel by bus.
But also remember the houses are close together and parking is difficult, so a vehicle would be a hindrance; they always walk the actual posting operation, often with a hand trolley holding the mail.
Perhaps they are often dropped off by Post Office Van to the start of the walk & make their way back by bus.