From Table 22
and population estimates from ONS we can see that the country is made of:
3.88m households with 1 adult @ £162 p/w, annual cost: £32.7bn
10.8m households with 2 adults @ £254 p/w, annual cost: £142.6bn
3.15m households with 3 adults @ £346 p/w, annual cost: £56.7bn
2.82m Children 12-15 @ £72 p/w, annual cost: £10.6bn
4.98m Children 5-11 @ £60 p/w, annual cost: £15.5bn
4.01m Children 0-4 @ £44 p/w, annual cost: £9.2bn.
Total annual cost for non-retired households: £267.3bn
3.75m households with 1 pensioner @ £132 p/w, annual cost: £25.7bn
3.22m households with 2 pensioners @ £201 p/w, annual cost: £33.7bn
Total annual cost for retired households: £59.4bn
Notes: I've taken the average cost for 0-2 and 3-4 payments since there's only data on 0-4.
It might seem odd that retired households have no children, but I've just taken the total figures for children and put them in the non-retired bit for costing. If a retired person/persons have children in the household, they will be eligible to claim for them.
The total outpayments from the scheme will be [/b]£326.7bn[/B].