In addition to affordable childcare, there is the issue that not all professions are M-F, 8-5. This is increasingly so in our 24-hour society and in many skilled and unskilled professions.
So what's a lone parent to do if they want to be, say, a nurse - not a 8-5 job?
Employers are not compelled to or given incentives to offer more flexible working conditions - something that would have the added bonus of cutting traffic congestion and pollution - so they don't.
There's the crux of the matter, in addition to unaffordable, too traditional childcare (8-6, M-F only).
Also the issue of no wrap around benefits.
It costs a packet to live in this country.
You go out to work, let's say you get a skilled secretarial job that pays £16,000/pa gross - NOT uncommon at all in the UK.
You lose all your housing and council tax benefits.
Well, it doesn't take a genius to determine you're better off on benefits.