Funny seeing this old girl again! I sold it to Martin back in 2008 and remember meeting him at his place to drop it off as part of a very long round trip with many stops for different reasons. If you have any questions then just shoot and I'll see if I can answer.
I acquired it here in Belgium, which makes sense since as commented above Donnay is a Belgian company. I assumed from the outset that it was a third party frame badged up, but never managed to figure out whose it was. I seem to recall that it has an Italian threaded BB but I don't know if that narrows it down at all. I guess not.
Thanks for this - If its an Italian BB I suspect its got to be knocking on the door of Alan - the lugs are very similar, even if the carbon used isn't (Although that could be more related to model year).
I am going to be looking at the BB shortly as I have to change chainsets on it.
Not sure if Alan or another company sold the lugs as a set?