 To the north of Ruislip High Street , the 22 acres ( 8 @.@ 9 ha ) Manor Farm site incorporates the remains of settlements dating back to the 9th century , as well as buildings including the Great Barn , dated by English Heritage as having been built around 1280 . A working farm until the 1930s , the farm was let by King 's College , Cambridge , the owners of the land from 1500 to the mid 20th century . It has been designated as a local heritage site and was refurbished between 2007 and 2008 with funding from the Heritage Lottery Fund . 
