Thanks mate,
That was some good advice. I had my Assessment Day today and the essay was nothing to worry about. It was a 3 part question, and so ended up being more like 3 short answer questions and was related to my desire to be an officer, personal qualities that I have which are pertinent to the commission and one other thing which I've since forgotten.
I've been recommended by both psychology and defence (very competitively from what I've been told), but unfortunately I've been issued with a class 3R medical for ambiguity surrounding a *possible* migraine that I had when I was 12 and an unconfirmed acid reflux diagnosis. I'll get specialist reports for both of these and hopefully everything clears up. I had no idea that either of these things would be serious issues!
VS