I've just done a bit more of a check and the ISS did infact go through in the area we were viewing. But it was running parallel to the horizon only 12 deg above the horizon runing from the SW to the NE and was after sunset. It was also only about mag 4 to 5. The object Mark saw was well before sunset and coming from the SW to the N but crossing overhead, and it was very bright.
What a great evening
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