Hi OP, I can see that there are a lot of comments about your DH's contributions etc and I won't add to that. But just by looking at your September expenses you could do the following:
Expenses in September:
£1,165.00 - childcare + holiday club for half term. I think there's another £84 for after school care for the month that I paid late
Childcare is a temporary thing - not much you can do about this
£551 - groceries (bigger shops at Ocado + Lidl, then about 20 tiny top-up shops)
Why are doing 20 tiny top up shops? You need to buy more during your bigger shops and use the freezer/food cupboard more. Think batch cooking, homemade treats, longlife milk etc. This could cut your food outgoings by about £100.
£283 - car finance
Can you get a cheaper car?
£250 - credit card - mix of airbnb costs from during building works + £100 in food shooping + takeaway
More food shopping??
£211 - loan repayment, taken out during building works
£150 - eating out (various small meals/coffees with kids or alone)
Reduce eating out - take thermos for soups or coffees instead. Or just buy things from cheaper places i.e. McDonalds. Waitrose do free coffees for Waitrose loyalty card holders.
£145 - swimming lessons 1:1
Do swimming lessons have to be 1:1? Can they not be in a group? And are the kids now competent enough to no longer need lessons - take them to your local pool and do family fun swims together instead.
£80 - one-off physio appointment
£20 overdraft interest
£283 - car finance
£100 - withdrawn at cashpoint. Can’t remember this at all, wonder if it was to buy something 2nd hand for the kids off Marketplace etc.
£60 transport (£23 fuel, £7 Uber, remainder on TfL buses/tube)
£22 - Entertainment (Netflix, Apple cloud storage, bookshop)
Can you get rid of any of this?
£13.00 - app subscription DD
£3.80 - charity subscription
£45 - car insurance
£95 - SumUp - no idea what this was substantively
£48 - critical illness insurance
£48 seems quite high for Critical Illness insurance - perhaps look at other providers
£4.60 x2 - google cloud - no idea why x2
Take your card details off Google Cloud/App Store!!
£36 - gift for friend following surgery
£36 is generous... even £10 flowers would have been fine, or homemade cookies!
£3.60 - booking for Halloween activity
£20 - new bin
I don't think you're overspending in many areas except food. For any other subscriptions/insurances - call them up and say you're thinking of moving to a new supplier - they'll hand you over to their retention team and give you a discount!
I also find the Money Saving Expert weekly emails are quite handy!