VP - VE

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tom said:

I think this is one of those things that will be lost in the mists of time, similar to why the Victoria Line codes run VP - VE.

I've been thinking about this, and after consulting the route planning map on page 11 of "The Victoria Line" by Mike Horne (ISBN 1 85414 281-X):

Norbury (Route 8/C, Scheme D) - VD
East Croydon (Route 8/C) - VC
South Croydon (Scheme D) - VC

The twin termini of Scheme D, Coulsdon North and Sanderstand, might have both been VB, or one might have been VA, in violation of signalling principles.

I wonder if this is the reason why the codes run as they do on the Vic.