Sleep with the boss's wife. Used to be the standard way to get out early. Not sure how that would affect your problems at home though!
...Well that just brought the whole tone down to ground zero
Just thinking out loud here, but during my time working with the dark blue, they used to give you a compassionate draught nearer to home. Since the RAF have far more bases than the RN and they are spread out more evenly in the UK; then could this not be an option for you?