I look forward to seeing an HP42 in the sim (apart from the free one parked at this freebie of Croydon Airport) but until then I’ll make do with my Ju52. Still I found the following article which may be of interest describing a diagram of the routes used by Imperial Airways in 1935. Also of interest, it was designed by Harry Beck who invented the London Underground diagram (afficianados will tell you its not a map).
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Ooh! That is nice, and super useful. Thanks for the link, and thanks for mentioning the Croydon scenery. I hadn’t seen that one yet! 
I’d love to see some more classics in MSFS. The Ford 4-AT keeps me occupied in that regard.