I'm on chalk so we don't get too much movement, but I'll have to watch out for roots from an apple treeLoose-lay on sand can be fine, but it does depend on your ground conditions. - Plus 'local' problems like tree-roots!
I am in Staffordshire, so on clay.. We get a lot of movement, depending on how wet the ground is.
I am guessing I will either have to go deep with supports, or live with fairly regular tamping and levelling sessions?