How to revert back to Kitkat? topic

Ok so i was on Retail UK Kitkat 4.4.4 but then i flashed GPE 4.4.4 and then flashed Lolipop 4.4.4.
Now i want to go back to Normal no GPE 4.4.4 and im just so confused on how to do it and a lot of people have bricked so im scared, can someone please tell me a way which is guaranteed to work obviously nothing is guaranteed but the one that has obviousley previous worked.