Try this one, John. I have been working on a plan of the Milwr Tunnel which I have overlaid on a 1:25000 scale OS Map. I have posted it onto my webspace at: www.gregorycollins.1966.co.uk/milwr_tunnel.jpg
Just follow the link and right-click on the image to download it (it is 3.63mb). It is not on view to the general public due to copyright and I will be taking the image back down again soon.
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Sadly Google earth changed their map api so it stopped working a while back. I think Cris was going to get the person who set up it to try and fix it so it might be worth asking him. He is a font of knowledge and my be able to help you with any questions.
Dave
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