OK...that's a stupid amount of money so let's go wild here.
First off: Move out of this armpit of a country (UK) and go live in the US. Get the investment visa thing: invest suitable amounts in several businesses with reliable enough returns and which will create American jobs to enable us to stay in the country.
Buy a craftsman house in Fremont, an apartment in downtown Seattle and a cabin in the San Juans. And an arts center, with attached gallery, store, coffee shop and gig venue. And, just for fun, a recording studio.
Get a hot tub.
Get hubby a Harley Fatboy, on condition he actually learns to ride the thing properly. Also, whatever ridiculously priced camera (I'm guessing Hasselblad but it's not my area) he deems necessary for his photographic career.
Pay Peter Buck whatever stupid amount of money it takes for him to part with Kurt Cobain's original Fender Jag-Stang.
Start a magazine for young women that's genuinely body-friendly and promotes positive living and empowerment rather than buying pointless products.
Pay off the mortgages of my brother, niece and nephew.
Pay to set up a small museum (preferably close to the local airfield) to house my uncle's collection of WWII memorabilia. (Has to be seen to be believed. I suspect he's the other Aspie in the family. What he doesn't know about Spitfires isn't worth knowing. Or used to, because he now has dementia and someone's got to do something about all that stuff before it gets thrown out by the house clearance people when he has to go into care. )
Donate to a few worthy causes.
Have a trip into space (thanks, misswoofalot).
Visit Bali, Tibet, Cappadocia and various bits of Europe.
And find some safe (ha!) way to invest the rest so we're sorted for life...
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"Grunge? Isn't that some gross shade of greenish orange?"