This single series seems to have been universally panned when aired but I actually found it very funny and was all ready to order the second series but that seems to been shelved.
Clunes is an acerbic, selfish, curmudgeonly, crotchety and fiscally tight driving instructor in the City of Preston. He lives with his girlfriend Anne and her 2 teenage sons. "Warren" looks quite different in his khakis and with a pepper and salt beard, quite unlike his Doc Martin persona who this character is unfairly compared with. The neighbours, driving students, and
shop assistants that Warren deals with all fit the bill of diversity but are all fine in their bit parts. He continually wastes his clients' valuable lesson time by highjacking them to takeaways, shops and distant locations so he doesn't have to spend extra time going out for his personal chores.
Anne's parents too are funny but only get to shine in 2 of the episodes. Too bad as many threads of the plot lie unexplored, and I felt another series might well have leveled it all out.