I agree, either support all parents in a fair way (working or not) or means test them all with no universal benefits being unfairly distributed (why should a 4 year old get a free school meal but not an 8 year old?).
Otherwise, watch out working families who have decided to have another child or move house on the basis of your current net income, you might get a shock when they next move the goal post.
There should be choice in how to bring up your children and once you have made that choice you shouldn't have the rug pulled out from under you. If they made these decisions to apply to children born after a certain date in the future then you have time and choice to make a decision on what to do.
Yes Lego, it would be great if parents could share the childcare and both had the choice of working part-time but that choice is only really available to people whose existing full-time employers agree to them going part-time. Also, if families were to do this, there would be a lot less HRT payers contributing to the social fund. Are you saying that you wouldn't need the tax relief on childcare though? And you wouldn't expect to get any CB either?
It's not just an issue relating to the economy either but about society.
There is value in having a SAHP, not just in the early years but also when they get to secondary school. It's flippant to say everyone can get an au pair or they can have your tea ready. I know plenty of well off dual income families who are now stressing about their oldest child coming home to an empty house (not stressed enough to be home though). A few of the kids at home alone have ended up phoning the police because they were scared by someone knocking on the front door or a window cleaner who appeared at an upstairs window.
They'll soon grow older and more confident and will soon no doubt enjoy the freedom of you not knowing where they are or what they are doing or who they are with but is that a good thing that there will be no-one around to supervise all these teenagers? (and what when their siblings join them at home alone and you are not there to keep the peace?).
Flexible working isn't available to everyone and employers aren't going to let all parents go home at 2.45 - that is called part-time working. Also, as far as I can see, this government is reducing workers rights not improving them.