I was in the same position and i got 80% of my childcare costs paid for by universal credit! U can check on benefits calculator, i have a fairly well paid job and work 4 days a week.
Have a look at the gov.uk childcare choices and I would also do a benefit calculator with potential childcare costs included in it. Entitledto.co.uk is a really good site to use.
In addition to the above, all children over 9 months of working parents are now entitled to 15 hours of funded childcare a week so this will reduce costs further for you. I earn slightly above the threshold for UC so the funded childcare has helped financially x
As of now (Sept '24) I believe you can get 15hrs (1.5 days ish) from 9 months
I’m unsure but best thing to do it head to either ‘entitled to’ or Gingerbread Trust websites to explore your options. Might be worth picking up the phone re Gingerbread Trust and having a conversation. X