thread EFI BIOS yes.
Have been for years. The distinction between BIOS as 'separate entity that sets up the bones of the machine to let you run an OS' and 'actually part of the OS' got blurred a long while back.
permalink So I can download win10 and stick it on a clean
HD?

I've got a 120GB SSD in this laptop and want a bigger one without having to faff on moving my install over.
permalink Most SSDs come with
tools to let you copy old to new with little faff apart from the time it takes, assuming you have a USB-SATA adapter kicking around. I use drive cloning on a separate box so I've never had to think about licencing.