Why is it that there are no RS Spyders entered in LMP2?

Every year I enjoy watching the UK-guys getting ready for their yearly migration to Le Mans, can't wait to join them.

http://www.pistonheads.com/gassing/topic.asp?h=0&f=25&t=764556&mid=0&nmt=Your%20Car%20Stickered%20Up%20For%20Le%...!