Cambridge recently sent out a mail suggesting they would be ideal for anyone visiting Duxford this year. Specially reduced landing fees and easily arranged transport. Might be worth checking with them? Their "flying community" is a free to join club with preferential rates. Try flyingcambridge.com or 01954 313105
Or Fowlmere. They are inside the ATZ for Duxford. They aren't as big as Cambridge, and you would need PPR, but I have been there a few times, and its lovely airfield. I assume also the taxi ride might be a touch cheaper.