[Pedant mode on]
I'd just like to point out that, in its final days, bmi had not been on the LHR-AMS route mentioned above. It stopped flying that route almost 3 years ago, and furthermore, closed Diamond Club membership to Dutch members, sending us into the sweaty clutches of Lufthansa's Miles & More. (The same fate befell Belgian and Israeli members).
http://www.flyertalk.com/forum/bmi-d...amsterdam.html
Also, by the time it finished, it wasn't quite full service in Y, in that one had to pay for anything consumed on board.