2009/3/19 joseph seddon life_is_bitter_sweet@hotmail.co.uk:
http://meta.wikimedia.org/wiki/Wikimania_2010/Bids/Oxford#Cost_of_living
What sort of things are you needing for this? General "Oxford is in the SE of England, so is relatively expensive", etc, or...? Amsterdam has some standard prices; Gdansk doesn't seem to mention this.
Travel costs might be tricky - I mean, predicting air costs six months out is tough, much less eighteen. It should be possible to do something comparable to the Amsterdam & Gdansk bids, though - all three may be spurious numbers, but at least they're comparably spurious ;-)