I noticed that you mentioned in the post you linked to about not being mislead by the Pipercross badge on the car. The
JCW Motorsport filter was actually made by Pipercross believe it or not. It was Tony Franks himself who let me into this little secret when they were fitting mine.
My claim to fame is that my old car was the first road car to have that filter. In fact mine was the first Works BMW MINI on the road full stop!