Tax Free Childcare is a scheme that allows you to pay for daycare and get a 20% discount applied via the government.
It works quite well, but I'm convinced there is a deliberate attempt to frustrate people and stop them using it to save money.
For example, you cannot bookmark the sign-in page, you have to search for it from the gov.uk homepage each time and go through several intro pages. And then you have username + password + 2FA + 3 security questions.
And you have to login every 3 months to re-declare your eligibility.