I'm writing that essay at the moment as well.
Try and show the statement he's making about the world at the time (and potential future manefestations of what's going on in the world) in
BNW. Look at what it means to be "in the wild" in the text and how this can be related to Huxley's context. It might help to define what you take "in the wild" as meaning. Also what you think "relationship with the natural world" means. Natural you can take as refering to a whole number of things like natural rhythms (look at the nature of birth, life and death in the BNW) or natural emotions (look at how they are controlled in the BNW eg. soma). Then you take those things and look at how they relate to Huxley's context eg. eugenics used to control who can have children.
Also, some general research into his context will give you a lot to work with. Try starting here:
http://en.wikipedia.org/wiki/1920s
http://en.wikipedia.org/wiki/1930s
Good luck
.