Steve Thompson is still a vauxhall dealers and did sell mantas as standard back in the day but also had the Irmscher franchise for the uk and built new and converted many customers cars, but to qualify as an orginal i200/i240 they were supplied from new with an ST parts build sheet.(with the basic spec for that car but could also be fitted with options from Irmscher catalogue or the Magard catalogues).
So to sum up the red one was supplied by the dealer but was obviously converted as you can see from the photos (has i200 narrow type spoiler and twin headlight i200 sticker was fitted not sure if anything was done to the engine,diff or suspension as you cannot see in photo or text.) at a later date so is not an original i200.
1900sr your right E45 SFK red i240 came with grey chicago as blitz was unavailable at the time,but was fitted by Sean Hunt under his ownership.
Hope no one on here's bidding on the red GTE thinking they are getting a genuine i200