I am a sahm as I don't want to pay a fortune in childcare
This line works when they’re 2, not 7 and 10. And I understand that it’s something you’ve kept saying because you’re scared you’re unemployable and you’ve already admitted on this thread that you needed the kick up the arse. So I won’t prattle on about what you could have done differently in the past.
Just two days ago there was a woman posting whose husband had walked out on her and may or may not keep financially contributing and they’d just signed up for a huge mortgage and her children WERE toddlers. He’d been hinting about jobs in the Middle East, so she wouldn’t be able to even chase him down and force him to pay. So she was trying to figure out how on earth she was going to pay a £3K mortgage and £2K in childcare from a £50K salary (she can’t - she’ll have to sell up, downsize, find cheaper child care, get an au pair, who knows). But we have no idea what your mortgage is (you say large; I assume it’s larger than that), and your DC have expensive hobbies (do they add up to £2K per month), and you have 50% of your household’s earning potential going to waste since you’re not working (not an option for that woman - she’s now 100% of the adults in her household). So…
Everyone is going on about finding something for just evenings or weekends, but if you’re REALLY so worried; take anything that will give you that extra £100 a week net. So if you have to work part time and you manage to earn £400 per week, but £300 of it has to go to school clubs to care for the children… that would STILL be better because it’s building your resume so you’ll be more employable, gaining you the career you’ve been missing all this time, and it’s given you the £100 a week you were worried about. Do NOT use the excuse of, “Well, X percent would go to [some form of childcare] and I don’t want to waste money on childcare.” That’s how it works; it’s not an excuse not to take a job, and your DH should support you as well and want you to build a career.