Northumbria biker: Mod have now confirmed that geocaches are not acceptable on any of their land and any already there must be removed. Their letter to GAGB includes the following -
"As discussed at the meeting, the MOD are unable to give permission for any physical geocache to be placed anywhere on the MOD freehold/leasehold estate (referred to here after as the owned estate). Whilst the MOD does operate a presumption in favour of public access on its estate, when compatible with military operations and training, we do not consider physical geocaches to be acceptable."
Full details at http://gagb.co.uk/forums/showthread.php?t=5151
I will arrange for the cache box to be removed as soon as possible.