Officially my kids are with their mother, although they do spend about 1/3 of the time with me. I don't qualify for anything as they are resident with their mum more than me, and as it's all means tested and I'm well over the threshold I wouldn't qualify for any kind of support anyway.
Kids do get 5 free half day sessions per week in a Nursery from the age of 3 and a half, but this is only in term time, so it's not much use during 13 weeks of School holidays.
If the Government really wanted to incentivise mums to go back to work, they should provide affordable childcare from the age of 6 months for 52 weeks a year.