Not seen those, I love them, when i see Zennor it gives me a warm glow, do you think it's a bit strange to love a portal dolman so much Roy? it's great now but imagine it complete before the blasting took place, have you ever looked at the portugal portal dolmans because some of them are very like the Cornwall ones, somewhere like http://www.megalithic.co.uk/article.php?sid=26149, Remember the tin links with that part of the world are that ancient as well, we could maybe learn more about these Cornwall ones from that part of the world.