15 years separate this book from James Taylor's `Riley RM Series' and, given both are histories of a range first produced in the late 1940s, there shouldn't be too much new that has been discovered between 1990 and 2005. I noticed that Taylor had more on the special-bodied RMs, in particular the `woodie' estate cars, and this book has more on other styles, as well as a bit more on the Pathfinder (indeed, the more sympathetic tone towards the design of this traditionally rather maligned latter model prompted me to buy its designer's short but interesting autobiography, Auto - Architect: The Autobiography of Gerald Palmer (1911-1999)
John Price Williams, like Taylor, has an easy prose style which makes this a book one can read from cover to cover as well as dipping in and out for reference. The book is well illustrated with, unlike the earlier book, a section of colour plates.
As someone who does not own but has always admired these beautiful sporting saloons, the finer technical points of difference between the two books perhaps mean less to me than they might to the dedicated owner-enthusiast, but I am nonetheless happy that both books sit alongside each other on my shelf. (As an aside, if you can get hold of a copy, I would also recommend Price Williams' `Alvis: The Postwar Cars'.)