The thing is, since the mystery photo was posted, someone on the MRS IO Group has conclusively identified the location, and this isn't it.
To put you out of your misery, here's another photo looking the other way, at the true location, but with renewed signalling:
[Embedded link to Warwickshire Railways.]
There's that mystery platform again.
This section wasn't quadrupled until the late 20s...
Cough, cough...