Graham and I were lucky to be permitted access to

Witham signal box in Somerset. Set in a very remote spot the signal box was an intermediate block post between Blatchbridge Junction to the east and Bruton to the west with the latter often switched out with the next block post then Castle Cary. In the box, we came across this interesting paper notice listing the bell call codes of every box between Castle Cary and Heywood Road with some scribbled out such as Frome South.