I don't know about "crown land." In the states, at least as far as I've found, keeping your hives on the government's land is a difficult task. If they don't benefit from it, they arn't interested in hearing about it.
But farmers are an easy sell. I found a farmer through a friend of a friend that lets me keep my dozen or so hives on his property. It's a bit of a drive for me, but he's thrilled. I don't think he knows that my bees arn't pollenating his corn though :-X It ends up he doesn't tend the land, as he is now too old. He rents it out to someone else, and when they finally met up with me they told me they have several other yards that they want me to put hives at. I told them that I'll be growing in the next few years and I'll give them a call. They were thrilled to find out someone will pollinate their blackberries and watermelons . . . FOR FREE!
I figure by the time I get all of his yards filled with bees, he'll be telling me about his neighbors. Lol.