That's a beautiful piece of English flint. Then again, you knew that considering you found it in England! I hunted for muntjac in England back in 2009 and was amazed at all of the flint laying in the fields, streams, road cuts, etc. The stuff was everywhere! I even located a fossilized coral head approx. the size of a volley ball. Man am I bummed that I didn't bring that back with me!