Hello Quicksilver,
as you might see on several photos the bespoke +4 has narrower wings with wire wheels (6x15 with 195/60-15 tyres), a little wider ones with alloys (6,5x15 with 205/60-15 tyres)).
The +4 & Roadster Sports always have the wider wings due to their 205/65-15 tyres on wider rims (6,5x15)
Hope that does help you a little....
Jochen