No mate, only about 12 digs today.
Hard to get a % on that old dog, when you breed lurcher to lurcher so many times you cannot tell whats been put into him. I know of at least 3 generations on our side, all collie greys, then put over other lurcher bitches. Most have been collie grey, but I suppose somewhere, other blood could be in there.
Looking at him at a guess i'd say probs quarter collie, but who can tell.