For those who are interested in postal orders,here is a book about the postal orders in use in the Bechuanaland Protectorate.The book is called 'The Introduction
& Usage of Postal Orders in the Bechuanaland Protectorate'.The author is Peter Thy.It was published by Krone Publications in 1994.You can contact Peter Thy through here http://www.kronestamps.dk .Please let me know how you get on?

Aidan.