Today I saw a black R400 parked up in the tyne tunnel trading estate when popping into Screwfix.
Looked pretty convincing (if there were such a thing) from the outside, with yellow trimmed front/back/side "R400" badges (where did they get those?), the fussy venting on the back bumper that the concept had, 4 larger than normal pipes and R rear lights. Had a scruffy set of Cadiz on, then you look inside and see a standard non-performance Golf steering wheel and standard SE rear seats, recaros in the front and a few GTI looking bits of dash trim.
Someone spent a lot of money to make their SE look like an R400.