A bit premature, old chap, the first editions of the first volume are only just flying off the shelves! There might even be a requirement for a second print run before any thought can be given to a Vol II.
As one of the contributors to Vol I, I know just how long it took to get this one off the ground (no pun intended) and am in contact with the 3 men behind its production; however, Cliff Spink is not one of them (only the Foreword writer)!
I am sure, if a second volume is to be produced, that a call to PPRuNe might just be a suitable avenue for a request for contributions although my pen has not been drained yet even after 4 tales in Vol I!
Foldie