what are the names of all the ancient woods?
aversley wood, balsham wood, bedford purlieus nnr, brampton wood, buff wood, carlton wood, gamlingay wood, hardwick wood, hayley wood, kingston wood and outliers, langley wood, little paxton wood, madingley wood, monks wood nnr, out and plunder woods, over and lawn woods, perry woods, ten wood, thorpe wood, warboy's and wistow woods, waresley wood, weaveley and sand woods, west abbot's and lound woods
of these, which has the least number of acres?
thorpe wood