I'm pretty sure that the car was "viewed" at a local show close to me. What probably compounded the issue was that his pipework was plasted over the local rag the week after the show.
All it could of taken was for an "official" to look at the pic and thereafter the letter appeared.
Personally, I didn't see an issue with the car from a legality point of view (it would have passed a coke can test, the tyres were good and the dials all worked