***L A T E S T ***N E W S***
I bought a new £20 Mi5 screen with digitizer, fitted it myself (learnt it from youtube videos for this mobile) and immediately the touchscreen works again !!!!!
I had tried all other members' ideas regarding small screw rearrangements in case static charge was causing the
screen to not respond to touch etc. A new screen fixed the problem I had mentioned on 25 April 2018. Hope thats a help to others users.