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Thanks Scott and Chris - that's really helpful advice.
I've basically been focussing on paleo proteins (nuts, eggs) supplemented by a soy-based protein powder. But I'll definitely check out the Whey protein.
And thanks for the book reference Chris. I'm always open to be challenged on ethics, and from reading the reviews it looks like it's right up my alley. In theory, ethics and paleo should go hand in hand (wild game meats for example), but it generally doesn't get much of a mention in the paleo literature. I've justed ordered it, and look forward to reading it.
Andy