This could run and run......so I thought going back to the original brochures would help.
The 8 page 4th series brochure ( the one with party goers in DJ's and long frocks, all smoking) sure enough has cars in several body colours, but all with the stainless steel trims and beige wheel centres, all fine there.
But - there's a pale off-white car with much darker beige wheel centres - to provide more of a contrast?
It gets worse - I've got two more different 4th series brochures , unfortunately in B&W, but the wheel centres in both are clearly much darker again ( black?) which contrast with lighter body colours.
So - I'm happy with the wheels on my car which is grigio celeste body colour and has the two colour wheels with trims - but this is clearly NOT the only scheme used !