Prompted by this nice review, we can confirm that a second edition of the book is in preparation. We hope to publish later this year: busy schedules permitting. Fred Smeijers is revising the text, to take account of new evidence and to include some of his further thoughts. The original files of the book have been lost, so we would have had to remake the pages in any event. This necessary fresh start is stimulating plans for the design of the new edition.