Question [Q] Rooting HTC One On Three UK?

Hi there,

I would like to root my device which is currently on Three UK and infall a custom rom. I am thinking of installing the Venom ViperOne rom but everywhere i have read and watched, the tutorials have been for rooting US devices. Will i be able to use the Viper rom on my UK HTC One and use the rooting videos for US devices?

Furthermore I would like to be able to return back to the factory settings at a later date just in case it needs repairs. I have read somewhere that i will need to flash the stock rom back on and reset the boot loader? is there anything special i need to do for my UK variant or will the videos using the US devices work for me?

Thank you in advance for any help given. You guys on XDA are brilliant when it comes to helping noobs like me