Woolston Signal Box, shown in the picture, is Grade II listed and a nice example of the once common LSWR Type-4 signal box design. It is situated on the platform of Woolston station.
https://historicengland.org.uk/listing/the-list/list-entry/1413387
The frame is preserved as part of the reconstruction of Midford Signal Box by the Somerset & Dorset Railway Trust, at Washford Station on the West Somerset Railway.
http://www.west-somerset-railway.co.uk/railway/stations/washford
http://forum.signalbox.org/viewtopic.php?t=3120