The primary objective in producing this publication, is to consolidate the existing information about the use of these collars, a practice only adopted by very few other countries. Following the Introduction, which illustrates the range of embossed postage dies and the types of ‘Official’ collars used, images of the of the Inland Revenue registration records are published for the first time. The companies which officially registered their collars are then described in chronological order of registration first, followed by the ‘Unofficial’ / Private collars created by other organisations which are listed alphabetically. An Appendix gives a detailed listing of the dates of printing of the three major users and is followed by a brief valuation guide and bibliography.