There's an outrageous lie at the top of page 11

From the DWP's Universal Credit: welfare that works:

The Government spends a further £3.5 billion each year on administration. The Department for Work and Pensions and its agencies spend around £2 billion a year, Local Authorities spend a further £1 billion to administer Housing Benefit and Council Tax Benefit, while HM Revenue & Customs spends £450 million administering Tax Credits. Multiple agencies use valuable resources to gather and manage essentially the same information.

Nope.

The DWP's own accounts show that it will spend £10 billion on administration costs (Total resource budget DEL) this year, page 89.

And as far as I remember HMRC admitted that administering Tax Credits costs 3p for evey £ paid out, and as they pay out £27 billion or something, that puts their admin costs at something like £810 million a year. Para. 1.2 on page 10 of this by the National AUdit Office says HMRC spent £581 on administering tax credits in 2007-08.

Tot that all up and stick on the very low estimate of £5.2 billion for fraud and error from the previous page and that comes to a nice round £17 billion a year. There are about ten million households claiming benefits and/or tax credits, so that works out at administration/fraud and error costs of £1,700 per claimant household, or £34 per week.