RISC OSMap of G.W. SignalboxesRISC OS
http://www.svrsig.org/gwmap/GWMap.htm
Sxxxx numberSignal Box nameView on map squareOther information including SRS diagram number
  Burghclere Map DE40
SU470579
SRS diagram P223 (1922, 1943)
  Highclere Map DE40
SU464606
SRS diagram P222 (1917, 1943)
  Litchfield Map DF39
SU460538
SRS diagram D84 (old and new boxes)
  Woodhay Map DE41
SU443633
SRS diagram P221 (1915, 1943)
Prices are shown here.