Just wanting to build a pc with windows 10 without the hefty £90 price tag. Can I buy windows 7 and upgrade?
Provided that the Win7 in question is legal, Yes.
If your Windows 7 license is legal and you complete the free upgrade on or before July 29, 2016. If otherwise, your free upgrade to Windows 10 will be illegal.
Great, thank you.
The free upgrades end on July 29th.