That sounds very promising idhawkdrvr.Well, I’ve flown 2 batteries worth tonight and the issue seems to have been resolved after reinstalling the firmware with DJI Assistant.
I almost panicked because I had no lateral/roll control at first. Turns out the reset also reset my Fly App settings too.
Will wait and see what DJI says on Tuesday after the Bank Holiday re as to whether their sending me out a replacement unit and tell them I'm not alone with the issue