cheapest way of going from 7 to 8.1?

[EdwardTeach]

I have seen windows 8 pro upgrades for around £60 online. Will they represent the cheapest way for me to upgrade from 7 to 8.1?

Am I correct in thinking i should be able to do a clean install to 8.1 with the 8 pro upgrade licence using the steps outlined in this thread:

http://forums.overclockers.co.uk/showpost.php?p=25245388&postcount=24

 

[Si105]

If you can get your hands on an 8.1 iso by whatever methods, you can just enter the 8 key into the setup/after setup.