We're trying to reduce our outgoing but I don't think there's much leeway TBH.
We have a mortgage of £800 and childcare of at least £600. That £1000 left is for food, car/commuting related expenses, and all other bills. We don't have Sky and only have Spotify and Netflix. Phone contracts are £25 each (we only have two). The obvious is food shopping but we reduced it to £80pw it didn't make me feel great so had to change it.