Not AIBU so much as WWYD...
I always find the finances threads interesting; a common theme tends to be completely shared finances, so I'm interested to see what people suggest for us 
DP and I have been together 3 years, not married.
We've recently bought a house together.
The house is split 50/50 - DP paid his half in full, I have a mortgage for my half.
8 years ago, DP's parents gave him an interest free loan for his previous house, and the house increased in value substantially so a combination of savings (no mortgage interest + being frugal) and house value increase left him with enough capital to buy his half of our house outright, plus leave him with about £70k in savings.
I'm employed and also run 2 businesses, one of which employs DP part time.
DP works approx 25 hours a week (admin work, WFH) - he earns £1,000 a month after tax.
I work 60 hours a week in my job, plus another 40-50 hours for the businesses. I don't need to do the job but I enjoy it, though its very physically demanding. I earn £3000 a month from my job, plus £2 - £4k from the businesses. (after tax). I reinvest most of my money into the businesses, and am setting up a third with my current savings.
We split the household chores evenly - though DP does all the dog walks (2 hours a day).
All house renovations are split 50/50.
So in summary:
DP works 25 hours a week, earns £1k a month, has £70k in savings - does not pay mortgage.
I work 100 hours a week, earn £5-7k a month, have £50k in savings - pays mortgage.
How would you divide our living expenses? (water, electricity, council tax, food, holidays, etc etc)
Please be nice, I know finances can sometimes rub people up the wrong way but if it bothers you, please just scroll on