Hudl Update installed with no problem and did not affect rooting. Only change that is obvious is 'Reset Touch Screen' option under 'Settings - Display'.
Cannot tell if it has cured the non-responsive screen problem as I never had this. However, the touch screen is much more sensitive to the slightest touch and I have had a number of unintended operations occurring. I am used to making a firm contact but now any fleeting touch registers to the extent that it may be too sensitive.
Still Android 4.2.2 but kernel 3.0.36+ dated 24 Apr 2014, build JDQ39.20140424.153851.