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As I was waiting for a 455 yesterday, I looked at the signal numbers and can confirm that from platform 1, each signal number goes by every odd number.
A more difficult one then. Does anyone know what the signal numbers were at the old St Pancras. I know P2 was WH7 and P4 was WH10 but I'm not sure about the others. Oviously in this case checking isn't an option, since the signals arn't there anymore, and I'm not sure if the signals at the interim station are numbered the same.