Thanks everyone for your replies, I appreciate the honesty.
What I was trying to achieve was an estimate of my bodyfat, as I think the BMI is irrelevant. But that's an argument for a different day. I honestly thought my BF was far lower than bmi, given I was seeing shoulder and arm veins when training. But I'm happy to admit I was wrong and I have a lot of work to do.
Apoklyps, my aim is to get to 15% BF as quickly as possible. I'm happy with how my strength and work capacity levels are developing. I've been following a high fat, low carb diet for the last 3 weeks, but not strictly. I'm working towards fixing that and I have good support from my training partner and gf.
Tsantos, thanks mate. I didn't consider that aspect of the situation. I have changed my training regime to target fat loss & work capacity and lowered my food intake to roughly 1800 cal a day.
I'm always open to suggestions, criticism etc.