As a pp says what are you including in this?
In addition to the essential mortgage/bills/utilities I have;
Food and household (combine these as I buy all my toiletries and pharmacy bits and cleaning products in my weekly online shop) - £600. You can easily spend a lot more particularly if you are giving DC money for school lunches every day.
Fun money, 3 separate pots - £125 for me, £125 for DH and £150 for family spends
Kids activities - £200 as our kids do a fair bit
Petrol/travel - £120 as we WFH a fair bit and also don’t have long commutes but we do use petrol getting to activities at the weekends and visiting family)
Haircuts - £40 average spend a month for me and DH, I dye mine at home and also cut the kids hair myself. I have friends who spend upwards of £100 a visit on highlights etc. I don’t get my nails/eyebrows done etc.
Clothes - average £100 a month but not every month if that makes sense. I might spend in the sales every few months or so. Most of this seems to go on shoes, almost everything else I buy on Vinted.
Any subscriptions - TV, Netflix, Prime,
Spotify etc I allow for £20 so we rotate and don’t have them all at the same time
Charity donations DDs
I also have a “slush fund” which is for things that are roughly monthly but not the same every month eg £20 for gifts for kids friends parties
Then for everything else I do sinking funds to save throughout the year, including holidays (however much you want to spend on a holiday divided by 12), car costs (£200 a month to insure, tax and run two family cars), birthdays and Christmas (£125 a month). It depends if you include these in your budget - you say “everything except bills” so I assume you do.
Some of the above categories will vary depending on where you live in the country but most of them are just down to lifestyle choices. I also live in the south east but regularly visit family in the north Midlands and think that cafes/pubs are more expensive here than there, as well as kids activities and things like kids birthday parties. Hair/nail salons are pricier and so are various services if you pay for those things like childcare, cleaners, window cleaners, gardeners. A coffee out is often £4 now, same for a cake, so if you like to take kids out at the weekends then stuff like this adds up. But it just depends on your choices really, and how often you want to be able to do things. Not sure if you’re moving from abroad or how old your kids are but friends do often suggest things like meeting up at softplay which can be over £10 per child at some places. Personally although we are on comfortable incomes we really watch what we spend on stuff like this as it would very easily add up and we consciously limit our spending to stick to the numbers above, particularly in the “fun money” category.