Found only a few years ago (& now on display in the house) is a valuable 1st edition copy of "The Jungle Book" ...from which we take our pack leader names!
http://www.guardian.co.uk/books/2010/apr/09/kipling-jungle-book-inscription
Here's a direct link to wimpole...
http://www.nationaltrust.org.uk/home/item287801/
There is a wonderful farm which is free once a year (worth knowing about) as part of National Farm weekend! full of rare breeds old & new farming machinery, demonstrations etc...
AND there is a wonderful park & house to look around ...there are even Geo caches hidden, you can borrow equipment to find them if you don't have your own For more information on hiring out GPS units go to the ticket office at the Stable-block. They are given out on a first come first served basis, and can not be loaned out after 3pm.
http://www.nationaltrust.org.uk/visit/local-to-you/east-of-england/view-page/item547580/
There are also cycle paths around the estate!
http://www.nationaltrust.org.uk/things-to-see-and-do/view-page/item553664/287803/