No problem Alan. I suspect there are more pedantics to the square inch than anywhere else here, including me but my maths is so poor I'm surprised I was anywhere near at 4p! When I did the RAE my friend and tutor pointed out that I got things wrong in my head but not when I used the calculator. He said I understood it but couldn't get the right answer. A Multiple Choice exam.... We both got a distinction. That was really funny and surprising, in my case
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Dave