I will judge it after I read it. I don't expect anything other than two or three lines with a more or less funny ironic old blokes statement and not really any deeper insight into his feelings or view. It might end with "it's a good vehicle to raise money for charity". But to put it onto the cover, it may help John to sell some more copies.
It's Mark Knopfler who really should write a book like this and who has the skills and capability to do it. But "No" is the usual answer.
LE