I was diagnosed with a serious illness this year.
I would really appreciate any advice or insights from the collective knowledge on this thread - thanks in advance.
Sorry to hear about this - its hard news to take and your brain must be processing a thousand things. I had a diagnosis about three years ago (albeit degenerative rather than acute) when I was also pretty much FI, but not RE. I stressed a lot about the future, about the potential of not being able to work, and the trade off between a high current income (with associated stress), and not knowing how much future work capacity I would have, or my partner would have if things turned downhill and she became a carer.
I slogged away for about two years after diagnosis, padding the stash and adding (financial) safety nets, and working out bucket lists. In hindsight, I wish I'd prioritized work and finances less - my health has been a lot better since hanging up the full time boots, despite having a first kid in that same time. Babies are a very different sort of stress! 20/20 hindsight says I should have focused on family, friends and ticking off the bucket list. Although, over the 3 and a bit years saving, investing and booming investment returns resulted in net worth going up from about $1.5 to $3.3m, so I probably feel more relaxed than had those 3 years been less lucrative.
Take a deep breath and have a good think. I found these issues really hard to think though as its depressing to think about life expectancy. However, processing them helped me a great deal in coming to terms with myself. A couple of questions I'd be asking myself:
1. Do I have any insurance coverage, either in or out of super. While its nasty to think about, if you have some life insurance in super, it would help to support a family without you.
2. You have $2m of investable assets, plus a paid off house. Even without your income, this could support the family for a long (perhaps indefinite) time. Your wife still has the ability to work too.
3. The kids are primary school and pre-school - they need a lot of time now, but that won't be forever. Even if you didn't earn an investment cent, and neither of you worked a paid hour, you could still spend $200k a year post tax (more like $300k a year pre-tax, akin to your incomes) for a decade.
4. Is it my role to enable FIRE for my surviving spouse after I'm unable to work, or to support my "half" of the costs of parenting through to my kids reaching adulthood? I came to the realisation that my spouse could (and may actually want) to work in the after time.
5. Do you really enjoy your work? Knowing that your horizon just got closer, is work what you would choose to do with your time, or would you rather focus on other things? For me, changing focus helped deal with the diagnosis and has improved the health outcomes (and I'm now doing a little contract work).
So, I'd get your headspace sorted out on those issues. You have enough assets that you can both take a career break for a few years and be just fine. But you need to decide what you actually want to do.
In terms of assets and investments, some more questions:
Why so much cash, and why the GBP?
What do you expect your healthcare costs to be? I've found that while I have some out of pocket costs (a few grand a year), getting really sick in Australia isn't actually that expensive. Its the elective stuff that costs $$.
Look into super rules for early release. Both incapacity (TPD), and terminal illness (2 years life expectancy) can be conditions of release. I ended up putting more into super for the lower medium term tax rates, knowing that if I deteriorated that I'd be able to set up a disability pension.
As for CGT and other estate issues, I didn't do a lot of research. Mostly because the course of my diagnosis is reduced function rather than reduced life expectancy, and I didn't want to mentally head down another rabbit hole.
Good luck - its a tough head space to be in. Feel free to PM me if you want to talk more.