This article from 2007 suggests a Chateauneuf du Pape but stops short of saying it was or is used during the toast.
http://www.gobarging.com/lock-keeper-july07.html
However the Worshipful Company of Vintners was responsible for importing wine from Glascony, Bordeaux wines are from this region. I'd say that it is a safe inference that the Swan uppers toast and toasted with French wine.
The other half of the two companies responsible for counting the swans is The Dyers Company and they once were a company the made clothing dyes but have become a charitable institution and I could find no reference as to their beverage preference.
Source(s):
http://en.wikipedia.org/wiki/Gascony
http://en.wikipedia.org/wiki/Worshipful_Company_of_Vintners
http://en.wikipedia.org/wiki/Worshipful_Company_of_Dyers

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