3000 living where we live - unless you move, you can't cahnge this, so you'll just have to pay it.
400 having a car - I'm presuming this is a car each, but again, I don't think you can cut down.
2750 childcare- How many chiddren?
520 supermarkets- sounds resonable, but if you really tried, and went for special offers, cut down alcohol, organic, meat you could save a bit here.
66 house/baby stuff- difficult if you were "poor" this is where you would cout down, but I'm sure you can justify this spenind. This is where you could go for two for one offers / sales.
250 holidays - Cornwall is lovely.
310 work related expenses - I hate these
175 cleaner - your choice -cleaner or dirty house, or you knackered. I no longer have a cleaner, but I have a dirty kitchen floor.
180 charity - you could stop this, but then you might end up in hell
120 computer stuff- What computer stuff?
50 books - very easily done. STAY AWAY from Watersones.
160 council tax - Unavoidable
40 water - unavoidable
75 electricity - ulenavoidable
35 phone/ broadband
162 life insurance
140 healthcare/dentist/opticians - NHS? This sounds a lot to me.
45 mobiles
120 presents - stop being so generous!
100 eating out - Stay in!
100 clothes- You could/would cut down if you were poor.
120 travel- Where to???
15 newpapers - stope these now! They are all available on line
20 kids outings. - Resonable.