I agree that parts CAN be dear for Japanese cars, BUT you don't usually need any.
Cases in pont, my neighbour has had an Avensis for ten years, secondhand when he bought it. In the last ten years it has had a new battery and a couple of tyres, I have changed the oil every year or two, but NOTHING else. My Lexus has had a new radiator and brakes , a battery (the original lasted ten years) and bizarrely a new seat switch, which they had never sold before, I am certain as the package was dated 1997 and covered in dust, other than those: general oil and filters and a couple of bulbs and a set of tyres , all this in 6 years of daily use of a (now) twelve year old car. Note that neither vehicle has had any exhaust bits, I don't see many vauxhalls or fords of that sort of age on the original exhaust, if any.
Toyota do a first three years of servicing deal for about three hundred quid if you buy a new one.