hmmmmm if nothing else it is a crap description and his original request of the car being released one month after payment was a joke.
However looking at the ad it looks pretty straight, the seller is in Essex, the car was essex registered when new/brought into country, it could have come in one of two ways, 1) southern ireland or 2) europe as a personal import, maybe the guy served in the forces beforehand
Opel have different specs that we do in the UK, there was a time when you couldn't get the MV6 in the UK it was a europe only model, as it is the basic model maybe opel save the cash by giving it wheel trims and steelies.
just a couple of ideas....still think it is over priced though
I have asked hom a few Q's on Ebay, will see how he responds
Update.....
The car was bought as a company car, he bought it from the company, the companies head office was germany and they dealt direct with Opel, sounds feasable....
He is selling as he has now bought his new company car off the company and is using that.....
This could possibly be genuine, but as you said Will he hasnt got any fedback which wouldn't help