Bills could easily be £1900. Electric, water, council tax, phones, oil, gas, health insurance, savings, food, car repayment, lunches, fuel, transport, nursery, there are loads of things. Then stuff like gym, dentist, presents, dry cleaning, holidays, days out, pets, charitable donations, god the list is endless surely
The list of what you could spend your money on is endless. But it's not all essential, far from it, and certainly not at the level that many on here seem to think of as 'basic'. A lot of the 'our bills, food, travel costs are X' are way above average which means there is an element of choice involved.
Just because you run out of money before you run out of things to spend it on doesn't mean that all the things you are buying are essential or need to cost as much as you spend on them.