I simply wish to understand what the Minister intends by the Clause, and the amendments tabled by the hon. Member for Beaconsfield (Mr. Grieve) seem to provide an appropriate means to find out. I am grateful for the confirmation that Duchy of Cornwall land is Crown land, as such land covers a large part of my Constituency. A number of the tenant farmers in my constituency are on Duchy land, so it will be interesting to know what it is intended in terms of designation and the extent to which common sense will be applied to the question of what constitutes Crown land that it is appropriate to designate and what is Crown land that it is not appropriate to designate? In the case of Duchy of Cornwall land, there is little that is appropriate for designation.

Secondly, I assume that the clause will cover any land occupied by the Ministry of Defence, whether it is Crown land per se, in which case it will automatically be designated, or whether it falls under subsection (3)(c). That might include land occupied by agencies working for the MOD—for example, since the dockyards have been privatised, they occupy some land that is not Crown land but that is used for the purposes for which they were set up.

Thirdly, I have a nagging suspicion that subsection (3)(c) could be used and, in my view, abused to define as criminal trespass entry on to land that is used for purposes that are way beyond those that might be defined as sensitive or relating to national security. I can imagine such a power being used in the past at Greenham Common, or today outside RAF Fairford, now a United States air force base. The base is protected by virtue of being Crown land, but the land outside is not, and we have already seen arrests by the   Gloucestershire police for peaceful demonstrations outside RAF Fairford against its use by United States aircraft. Questions have been raised about the legality of that police action. It is not hard to imagine a Secretary of State being prevailed upon to say that land outside MOD land, or outside land used by Allied forces, required designation in the interest of national security.

We need to know from the Minister the extent to which she believes the power will be used—clearly there are areas where its use is sensible, and there are areas where it would be an abuse. Unfortunately, it is hard to perceive such discrimination in the text of the clause; perhaps it cannot be built in, and we have to take it on trust that the Secretary of State will act in an appropriate way. However, I dislike taking things on trust from any Minister, simply because they may change.