I have basically trawled all the potential fixes I've come across on this forum to find a solution to this issue - so many to list and include among other things, reinstalling Sky Go after uninstalling previous installations also Sky folders in Appdata Roaming; temporarily disabling virus software; ensuring Sky Go is permitted through the firewall; running the software as administrator under preferences.
The latest iteration of software reinstallation produced the error message PFE-9303