Bit of a boring post, sorry! 
About to buy our first home, two adults, we live in the north, combined income of 3k per month.
We have budgeted:
£700 mortgage
£600 bills (council tax, house insurance, gas, elec, internet)
£300 direct debits (gym, pet insurance, phones, Netflix...)
£400 travel (petrol, car insurance, tax)
£250 food
Left over cash to spend/save: £750 p/m
Is this reasonable? Are we over/under estimating or forgetting anything?