The IOM Post Office will launch its new Christmas stamps on October 20th. They are really sweet. A set of six stamps costs £3.69, the presentation pack £4.44 and the first day cover £4.39. The Jolly Christmas Postman books, by Allan and Janet Ahlberg. The Jolly Christmas Postman and The Jolly Pocket Postman, successors to The Jolly Postman, have sold more than five million copies worldwide.