It looks a lot clearer on the street view to be honest and obvious that it's a sign for the side road. Risky to take it further I think.
There's also a 40mph repeater within 100 yards of the junction so there's no chance you'd win in court.
I've just realised where it is as it's local to me. The streetview picture in the op makes it look much worse than it is in real life. The sign is at the same angle as the side road.
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