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Alt+Space is currently used in Windows for the keyboard layout switcher if you've got 2+ configured, at least on my setup.

I use it to switch from UK layout to US (long story).

Is that really the default? It's mapped to Alt+Caps for me as long as I can remember

Aye must be. Alt+Caps is just toggling Caps Lock here.

Shouldn't haven't modified anything for it, do my utmost best to just use WSL for work.

That's Win+Space.

Ah yes. That's what I get for touch-typing... Thanks.