Recently, I was contacted through this website by Sally Horsnett. Sally owns this charming high chair which she bought from a farm sale in 1991, close to Philip Clissett's home (many thanks to Sally for allowing me to photograph and publish this image).
This chair is fascinating for being stamped PC on the tops of the back legs - previously unknown in a ladderback. In fact, this chair is a blend of Clissett's two principal styles. The legs are turned in the same way as his spindleback chairs, while the back and arms are based on his ladderbacks. The only other Clissett high chair I have seen has all the usual characteristics of his ladderback (see the ladderback gallery).
Furthermore, this new chair is built without pegs, except for two which secure the upper back stretcher into the back legs. These stretcher pegs are not a normal feature of Clissett's work – I know of one other chair with these.
I am fairly sure that Sally's chair is a Clissett family piece.
If anyone knows of other unusual Clissett chairs, please do get in touch.