No, I have had this for a number of years. Have planned to build it the last year or so. I was able to purchase from a deceased estate around 20 Kirk Gresley coaches, some which are not available from Hornby. So have been making these first. None of these are available at the moment from the owner/manufacturer unless he has some stock when he attends exhibitions. We have been told that his dies/tools have warn out or something to that nature.
Though, If hornby did produce a observation car, I would buy one to replace the Mailcoach one as the rear end is nothing like the real thing.