I've just worked mine out. £12556 pa, including food, running a car and petrol for work. What have I forgotten?
I earn a lot more than that, I must be way more extravagant than I realised!
Even with, moderate "luxuries" like a modest holiday, haircuts, new clothes, gym membership and generous Christmas and birthday presents, I only need about £25k.
I really need to pay closer attention to what I do with the rest!