I was invited to visit this barn by its owner. It was originally the guest house of the abbey. It had been on one of the pilgrim routes to Canterbury and so had needed a large one.
After the Dissolution of the Monasteries the upper floor had been torn out at each end so that it could be used as a barn.
When it became obsolete for this purpose it gradually fell into decay. The present owner is gradually restoring it for private use. He occasionally opens it to the public during Heritage Open Days. Keep an eye on their website.