That's very interesting. I can see the temperature being 17ºC, but the Pressure figure is a bit of a mystery, since it seems that the sea level pressure is about 996 or 997 mb (found by taking a Spitfire down to sea level and changing the pressure setting to zero the altimeter).
I suppose that it could be 745 mm Hg; that would be about 993 mb. So I'm still a bit confused. Of course, this assumes g = 9.80665 which is the standard value for 45º latitude.
Converting up to g = 9.812 (which is the figure Wikipedia lists for London) isn't much help.
However, if we take g to be 10 instead of 9.80665 then 745 mm Hg converts to 101283 Pa, almost the standard sea level value of 101325 Pa. But this is probably coincidence, given the 996 mb reading...
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