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FWIW I would tend to agree. I'm sure it's a nice enough & well loved rifle but I think it's just a heavily sporterised Long Branch No4.

Hope I didn't pee on anyone's cornflakes.

ATB

It's a remarkable photo indeed but I couldn't add anything to what others have said. I think cheesycigar's inital assessment is likely to be accurate. If only someone could contact any of those guys...