Hi --- Yes, of course they wiill take account of all your personal financial circumstances.You need to complete an income and expenditure accounts sheet and present it to the court as evidence of your financial situation showing all your income opposed to your expenses for everything, you should include all the associated expenses you incur and the court will make an order that you are comfortable with.
I enclose an example of a I & E accounts sheet below, you can put your own figures into the sheet then print it off and hand it to the court, the court will make an order and ask if you are in agreement, if not explain why you are not. If they make an order that you still feel is too high then you can apply for a variation order by asking the clerk of the court after the proceedings.
Good luck & try not to worry the courts will listen to what you say, just be open and honest and state your case clearly.
http://www.insolvencyhelpline.co.uk/info-centre/budget-calculator.php