On the North wall of the Close of Salisbury Cathedral, Wiltshire, England, is a groove with the word MERIDIES, which is apparently a noon mark acting in conjunction with the spire. The spire is just over 400 feet (122 m) high and the wall is nearly that far from its base. It was mentioned in BSS Bulletin 91.3 pp22-23 and also in Peter Ransom's "A Dozen Dials". I hope to publish some more about it in the BSS Bulletin in the near(ish) future.
Of course it's not as big as Mont St Michel (see http://maget.maget.free.fr/SiteMont/ for some details of that temporary dial) but it beats most other things - but wasn't there once a (now non-existent?) "mountain dial" with markers on the hillside somewhere? However the "volume" definition of size is a very good one for eliminating a noon mark! Andrew James N 51 04' W 01 18' -
