Just discovered that GSearch reinstalled itself yesterday but GFirewall hasn't reappeared yet and neither have the annoying adverts for now.
I also found this on the Malwarebytes forum which relates to the item mentioned in Jo's post above (com.uucun4470.android.cms) and is linked to a dubious alternative Playstore.
https://forums.malwarebytes.org/inde...rojansmsagent/
Not sure what the above tells me however. Perhaps someone could translate...
TIA