Walking books

I'm just about recovered from Friday's walk and am now planning another big wun. I have several walk books. I have 1001 Walks in Britain, but they can be a bit tricky to follow though I have done a few. Then there's the Capital Ring and I have done all of those, some twice. My current favourite is the London Loop featuring huge long walks through suburban London - that's the one I did on Friday. I also have the Thames Path but, to be honest, you don't need a book to follow the Thames. The question is which shall I attempt next? Eeeny meany miney plod.