Even if you have a long commute then I can't see why more than about 20 hours should be necessary?
Surely it would make more sense to fund a smaller number of hours properly instead of promising 30 hours but not funding it properly?
As I recall when mine were pre-school age, we got 15 free hours once they were 3, for which we were very grateful. We needed 3 full days childcare so obviously paid the difference from our income.
I'm all for supporting parents to work but 30 hours seems totally excessive for the majority of parents.
I know there are plenty of parents who do work full time and therefore do next 30+ hours childcare but it seems fair that parents should have to pay a chunk of the childcare themselves and somewhere between 15 and 20 hours free is a pretty generous subsidy surely?