Who can I get to write the foreword in my book?

[petemc]

So I need ideas of who I should get to write the foreword. So far I'm tempted by Martin Parr. He's a big name, a Magnum photographer and has also spent time documenting Liverpool. The book is basically photos of Liverpool. So I'm thinking he'd be great for it although I am of course worried he'd hate my over processing. I'll probably approach him as he can only say no. But I'm after backups, or better. A lot of the photographers I respect are either dead, unsuitable, or simply very talented amatuers. I think I need a credible person, a name to essentially validate the book. "I'm a good photographer. You know me. I endorse this book and declare it open." Sorta thing.

So far I'm thinking Martin Parr or Tom Ang. Any ideas? Oh, another suggestion was famous Liverpool folk. Just to have your average famous Joe say something.