Yes thanks Phil, I'm in the same boat.
I got my set today (for the record if anyone is counting, I applied by post and my copy is no 956.
An incredible body of work. My only criticism is that some of the images, and their captions, are spread across two pages, and with quite a tight bind, it is to the detriment of the photos. It's also hard to read the text in some cases. That said, thankfully there aren't too many instances where this happens, and it's therefore not a reason to not buy the books.
Volume two, particular, is of interest to me with a wealth of Glasgow-Aberdeen trains documented.