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Thanks everyone. I do feel privileged.
Douglas, I've had dogs all my life, Mr. J2 adores and kept lurchers. This was not a cross of any sort, I'll vow. There was just something about it and I took some time to convince myself.
Been looking up wolf pictures and I am more certain than ever that it was a wolf, a young-ish one, not quite full-grown. The snout was chiselled perfectly, as were the ears. I can see it now. I'm not supposed to report it am I? I don't want to.
When I lived in France and was troubled by wild boar tearing up my land, I learned that they can travel 30/40Km in one night, so it is quite possible that wolves could have moved from the Highlands over a matter of years.