Not sure of the exact percentages but I know for sure he's got Grey, Saluki and Bedlington in him. He growls like a terrier! When he play fights he never give's up and he sounds very aggressive, but he's very placid with people.
The Merle apparently is Bull, Grey, Saluki, Collie. I've found since I got the pup that the Merle has matured and is not as giddy as she used to be. She used to jump up at people when we had visitors, now she's just chilled and relaxed. Strange....
sounds along the lines of what i was looking for in a pup, good luck with it mate