I have scanned this thread, so big apologies if this repeats what another poster has said.
I am a teacher; I teach full time. I have 2DCs and am contemplating a third. I am also the main earner and had no choice but to return to work FT after DS was born. Now I have more of a choice, but am happy with my current arrangements. I enjoy my job, and I chose it because it gives me 13 weeks a year in the home with my children. Plus I get home at 3pm most days as we finish early. I work on an evening when DCs are in bed.
I think it comes down to a few things. Are you a mainscale teacher who wants to stay on mainscale/UPS with no additional responsibility? If so, you should be able to get another job (subject permitting). However, you will probably get a temporary contract and you are more expensive and less in touch than NQTs who you might have to go up against. Supply is a possibility.
It is sometimes worth keeping your hand in if you intend to work again once your DCs are older. This would keep you employed, keep you up to date and keep your pension contributions being paid. You wouldn't earn a great deal, but there is always the choice of going full time which would significantly increase your income. If you didn't want to do that, then try to see the £100 as temporary and an investment in your future earnings.
By the time you are due to go back to work, your oldest will be nearly 3 and entitled to some nursery hours. Some childminders do a discount for a second child, and charge half fees or nothing through the holidays - much cheaper than many nurseries.
In an ideal world, I would have had lots of money available to me and would have stopped work until DS was 4, then picked up where I left off in my career.
We try to make the best of it. We are lucky that, as teachers, our income isn't too bad and we can afford choices.
What would you do if you still had free childcare? If you would work, then maybe you should try to do it still.
If you can afford not to work on DHs income, then enjoy your kids and worry about it later. If your income was a nice extra that you can manage without then it wouldn't be a problem if it takes a while to get back into teaching when you are ready.
Good luck.