The Rushden Cavalcade of Historical Transport & Country Show takes place on Saturday 1 to Monday 3 May 2010 just off the A6 Bedford Road, South of Rushden, Northants NN10 0SN; it includes a real ale bar.
The provisional beer list is at:-
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The list's heading still shows 2009, but the page-updated date shows 23 February 2010, so I'm assuming it's this year's list...