That's the interesting part Eskimo, the WSPS version was published by SI Model Books Ltd, this latest version is published by Fox Chapel Publishing.
It looks like Mr Hall has changed publishers and is now selling his books under a different title to supplement his retirement income.
Fox Chapel is also publishing some other volumes that look suspiciously like Workshop Practice Series books, Mini Lathe for Home Machinists by Dave Fenner looks like one of them
The Mini-lathe (Workshop Practice) : David Fenner : 9781854862549
Mini-Lathe for Home Machinists