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I can confirm that ME is for Marylebone. The 'box' is in the station buildings, not a traditional box as such.
There is considerable detail about recent resignalling on this line at http://www.signalbox.org/forum/viewtopic.php?f=5&t=2902 for anyone who's interested.
OK, thanks for that. I knew the old signalling was replaced in the early nineties. West Ruislip box is still standing, not sure why they have left it there. Princess Risborough box has survived into the custody of the Chinnor & PR Railway.