Perranwell was the only 'elevated' box in Cornwall at this time. There was a similar (though slightly more modern)structure at Carne Point , where the box had only a short life (1920-1925). It was re-used in South Wales.
Roy Hart Rangoon Burma
Many thanks Roy. Chris Osment will see your info.
Brian Pibworth has just posted a comment on your blog post, Perranwell Station and Signalbox Chris Osment:
There's a similar pic in "Western Steam In Devon & Cornwall" by Michael Welch, with the same closure date. I use Perranwell from time to time and have wondered about the old pump located at the Truro end of the platform. Was it for the station or to serve the cottages above? In any event it would make an attractive addition to a model layout of a similar branch station.