The idea of having a divorce finalised and then telling them seems really deceptive to me?
It's what we're doing. If it's wrong I'll let you know. I am actually more worried about our elderly parents fretting, and kids can't keep secrets from the oldies, so I want a grand reveal when basically everything is done. My kids are teens & adults so different calculus. Problem with little ones is they will assume the change is instant, so another reason to delay. We just told one adult (dependent) DC and they aren't unhappy at us for keeping it quiet so long.
I also wanted as much certainty as possible before telling everyone. A grand reveal and we'd have answers to their big worries & questions.
Timeline below for an amicable split, btw, because I couldn't find this ANYWHERE when we started (months ago) is like this
day 0: you jointly file the initial permission form, £593 to pay
week 20 (after above) : get asked to confirm want to divorce, both must confirm
about week 23: plan to divorce read in court, get conditional certificate that allowed to D .... (make final financial arrangements, probably need solicitor help to do the financial consent form) ...
about week 31: allowed to apply for final split, pay more money to courts, £59 ?
about week 37 weeks: if no objections by court to previous, finally formal split.
So even if you file tomorrow, you should expect a 36-40 week process to get through. 9-10 months. Longer if the courts disagree with your initial plan. Because little kids would think the change was instant, I would be minded to wait to tell them. We are at week 28 btw.