Thanks Arfon. Me too :-) The judge said it would be stronger if the composition was altered by changing the viewing angle to the side a bit so the passage did not lead dead centre. That may suit the rule of thirds but, respectfully, in this case, I am of a different opinion. The symmetry of the passage tomb is part of what I wanted to show. It would have been hard to "take a step or two to the side" as well, given the tomb is pretty narrow!
"Everything you hear is opinion and everything you see is a perspective; it is not necessarily the truth." Some attribute that to Marcus Aurelius and some to others - but it's so true wherever it comes from.