Provide 15 hours childcare for working parents with multiples under 3 yrs old

Having to pay double (or more) for childcare is prohibitively expensive in the early years before age 3 when the government childcare funding kicks in.
The detrimental impact of financial strain from not being able to work or earn enough to fund childcare can have a direct impact on mental health.
Unless a family is on low income (under £50k), they do not qualify for full Child Benefit or other benefits. But even income of £50k+ is not enough to support a family living on the outskirts of London.
Having children staggered in age means there is a staggered charge/period of relief but having twins or more negates that relief period.