For starters "other" is more than a bit vague!!
How many people is this covering? Just you and partner or any dc?
Roughly where you live - living costs vary greatly across the Uk.
There seem to be dc based on "school fees"
You also don't seem to segregate budget items by "need" v "want" which is an odd approach to my mind.
From what I can see and based on my own budget which is based on the following list -
TOP PRIORITY
Rent (mortgage in your case)
Council tax - these always have to be the priority payments
Debt - inc car payments, credit card expenditure as you need to keep on top of this in order to avoid high interest or late fees
Energy (gas/electric)
OTHER ESSENTIALS
Contents ins
Wifi
Phone & phone ins
Groceries (not just food but toiletries, cleaning products etc)
Clothes and shoes
Household items/home maintenance (everything from light bulbs to new furniture)
PERSONAL CHOICE/LUXURIES
Which? Membership
Streaming services
Birthdays and Christmas (I save through the year for Xmas)
Personal expenditure
WHAT YOU SEEM TO HAVE FORGOTTEN IS :
Council tax - as mentioned
Childcare - for 3 yo
Clothes and shoes - is that "shopping"? If so does this include school uniform, gym kit and equipment?
Toys and equipment - for 3yo as their needs change so quickly at this stage
Haircuts - I cut my own but most don't and it's an often forgotten budgetary item
Transport - not sure if you forgot car stuff or if you meant you don't have a car
Medical - first aid, cold n flu bits, opticians, dentist etc
My rent is about 25% of my income
£6000 a year on holidays seems a lot to me but then it's been a while for me
You seem to have a very vague approach to finances generally. I think you'd benefit from creating a proper Statement of affairs listing at the top the essential costs and at the bottom expendable luxuries.
I think perhaps you'd also benefit from considering wastage too.
Yes you're fortunate to be comfortably off but you never know what's around the corner, plus it's silly to spend more unnecessarily if you can still get the same product/service for less.
Have you both got employment protection?