It took me longer to get the photo than you two took to recognise it! I had hoped that a well hidden chapel away from East Kent might be harder.
It is indeed St. Benedict's, Paddlesworth. Grandarog gets the brownie points. Built early 12C. From 1678 until the early 20C it was used as a barn. It was restored and subsequently declared redundant in the 20C and is now in the care of The Churches Conservation Trust.
The pair of you have created a problem for me. You both got it within three minutes of each other. John only identified it by "looks like Paddlesworth" and "probably used to house livestock". Grandarog made a definite statement, included the dedication and ownership. Therefore I'm awarding it to Grandarog, but only by the shortest of short noses. I hope that's fair.