here's something I found that describes the Leigh barn - somewhere I think I have a book on traditional woodwork of this kind, but gawd knows where...

The Tithe Barn, adjacent to the church and Leigh Court, is reputed to be the largest medieval full cruck barn in England. It was built towards the end of the 13c for the storage of tithes. It is over 150 ft. long, 33 ft. 6 ins. wide and 34 ft. high, has an acre of roof and two gabled wagon bays on the side facing the church. The roof is supported by 9 full cruck trusses and 2 half-hipped trusses at either end. There are 2 further trusses in each bay. The barn was recently rebuilt by English Heritage. It is open to the public from Thursday to Sunday inclusive during the Summer months.

http://website.lineone.net/~geoff_a_wright/amenities.htm