@Arrowhead-IT
I followed your advice RE: using diskpart and managed to get both my Dell 5450 latptop and HP 800-G1 desktops to boot legacy/MBR, install Windows 10 and can now successfully capture/deploy using single-disk resizable FOG image.
I’m pretty sure I had default GPT/UEFI Windows 10 multi-partition image capturing and deploying previously but maybe I imagined it?
Thanks for your help.