Well I would certainly start by upping the minimum wage to the level where it might be possible to support a family without having to top up using the benefit (or tax credit) system. Why should the tax payer be subsidising the likes of tescos and sainsburies who should be paying workers a living wage?
Set the minimum wage at £10 an hour and be done with it. If people are running businesses that are uneconomic when paying a living wage, then they should not be subsidised by tax payers. I might be prepared to make a concession for small businesses in their first 5 years of operating, but as a rebate from NI payments (so that employees still get properly paid).
Recycle the not insignificant cost of administering the tax credit system into increased benefits for those paying for childcare in order to work. But give a set benefit per child, means tested.
Scrap family allowance for those earning above £40k and redistribute it to those that need it.
Stop selling off social housing and make sure it is fit for purpose.
Extend the assured shorthold tenancy from 12 months to 3 years with annual (rather than 6 monthly renewals) but make it easier to repossess in cases of default.
I could go on all day, but lunch time is rapidly coming to an end!