2Pm on the 11th is good, found another path onto the heath from my new house that takes me past a few good fruit patches.
It's a good place to stock up on tinders, I've seen about a dozen types of fungi when I've been there recently, masses of blackberries, elderberries and things like apples, sloes, rose hips, and other autum goodies to eat.
At the moment there isn't any potable water to speak of so bring your own.