I've got a fairly old (8 years) Mazda 6 that does barely 5K a year as we use my wife's company car (52 plate Mondeo Titanium X) for pretty much everything (she does over 50k a year).

I'll probably buy the Mondeo in a couple of years time when she gets a new one, as MCFCTrick says, it'll be high mileage but will have a full service history, everytime anything goes wrong, it just gets fixed/replaced etc. and the lease company will virtually pay you to take it off their hands !