If it is really there it is repeatable...
Zoom in and take more shots just in case you are on to something but I think the explanation has been found☺
Alex
I absolutely accept it as some artefact as it appears to occur to all stars with the same/similar apparent size.
I was more looking for an explanation, is there a technical term for this observation? What causes beam like structure to appear from bright dots of a particular size?
Looking back, I should have phrased my original post better.