Am thinking through my plan (such as it is) and am suddenly overwhelmed by how impossible it is all going to be. It's so complicated I'm not sure I can even explain it, but I'll try.
I'm applying for jobs. If I get an interview, I will have to arrange childcare for the dcs. They will wonder where I've gone. Maybe I can get away with saying it's a medical appointment and hope they don't ask more... but I have never had to leave at 6am for a medical appointment before and the place I'm applying to at the moment is not near here.
If I tell them it's a job interview (won't be too surprising, as they are aware that FW and I have discussed my return to work), there is a small chance they will mention it to FW. Not very likely, but enough to worry about. Even if the dcs don't know what's going on, FW wants me to apply for jobs - overseas, preferably, but he was coming round to the idea of being in the UK as long as he could choose the location. I could end up with a real job under my belt, having conversations with FW full of complete fabrications about where I'm applying and what success or otherwise I'm meeting with. 
If I avoid all that and go down the honesty route, I'm stuck with him and the dcs knowing I'm leaving, but not actually able to leave yet, which sounds intolerably stressful, for me yes but chiefly for the dcs. Mind you, uprooting and moving miles away with no notice at all is going to be similarly stressful for them - but how can I prepare them for it without also preparing FW?!
Plus there is this three-week Easter holiday looming on the horizon, which I feel I must be at (FW not entirely careful about childcare; dcs would miss me; don't feel I can pull them out of it as only chance to see distant family, who in fact I'm really looking forward to seeing as well!), which will be much easier if he doesn't realise I'm on the verge of leaving.
Part of me wonders why I'm so desperate to lull him into a false sense of security before pulling the plug - any answers to that, anyone? Am I avoiding inevitable difficulties as long as possible? Is it totally unfair? 'Cause it feels it.
These problems are all looking insurmountable at the moment. Please could you use your perspective from outside the situation and tell me they're all molehills, really, and point out the paths to the summit? Thanks ever so!