Definitive answer from Brian Eno (12.2003):

Leek's Hills is a little wood (much smaller now than when I was young, and this not merely the effect of age and memory) which stands between Woodbridge and Melton. there isn't a whole lot left of it now, but it used to be quite extensive. To find it you travel down the main road connecting Woodbridge and it lies to your left as you go down the hill..