In reply to The Pylon King:
You don't have to be "rich" to own land, anyone who owns their own house, including myself, owns land though it wouldn't be much use for walking over or for any other activity.
Perhaps a better way to describe ownership would be something like: legal custodionship or stewardship. The land will be here long after any current "owner" so it's a matter of keeping the land in the best state for the next "owner" to look after.
What the land is actually used for is a side issue and does shift with time. Only 70 years ago the overriding primary use was food production, now that we have a more efficient agricultural sector and import a large amount of our food other uses, such as leisure, have come to the fore. Along with that is an increased awareness of the environment so things like National Parks, Areas of Outstanding Natural Beauty and SSSIs have come in to being. Would you insist on being able to trample anywhere in an SSSI?
I don't know the reasons why the estate bans access to Lazonby, I doubt I'd agree with them as a lot of such bans are rooted in ignorance dressed up as "tradition". There may be some valid ecological reason why a ban is in place - Chapel Head is a good example of this - but I doubt it.
ALC