I'm rather confused as well as I wanted to let Scott know what info was available in the UK, one problem is that information is spread across publications and articles and in fact his Workshop is an ideal way to pass on the relevant information.
Tom, I'll find the links later but I'll also see what books I have in storage here in the UK, I know one is sat on my book shelf in Turkey. You can borrow them if there any help to you.
One gives a complete lis of UK galleries who exhibit photography and sates the exhibition policies etc. It's quite normal for decent galleries to book exhibitions up to 3 years in advance.