It took a while, but I finally found a picture! The infamous rally Allegro in all its glory, complete with seventies-style men. Find out more here.
Here's another picture of a genuine works Allegro, taken at Silverstone in 2005. The same car, or a different one? Certainly a different paint job. Needs a slight T-cut.
The same car (I presume) spotted August 2006. Well hasn't someone been busy!