Must be stuck for a few quid. He already documented much of his tenure in "The Boss" in the early 2000s. And is classic fodder for the blokey "footy" takes on the "Under The Kosh" podcast. Not sure how much more useful insight he'll have.
Like most Villa managers who resign, they end-up regretting it and he's a classic case in point.
"The Boss" came out in 2000 just after the cup final IIRC.
So there's plenty to tell about what happened in the 25 years since with Ginola, Balaban, the ending with Doug, all the stuff that happened with him at Derby when he was placed on gardening leave and also at QPR with Briatore and Ecclestone (bet he thought working with Ellis was a tea party after those two!).
And then how he ended up working Kazakhstan and Israel.
Brian Little did similar a few years ago, brought out a book that detailed all the manager jobs he had after leaving us which weren't great apart from a good cup run with Tranmere.
Edit: First book was ghost written by Martin Swain, which is a journalist's name I haven't heard for a long time.
He and JG once randomly appeared on an Ian Wright chat show (with Paula Yates) in February 2000.....