Though support from Sophos here was lacking, I found the answer elsewhere. This PUA on a Mac is more annoying than dangerous. "Sophos Free" could not remove this PUA because it was in the browser ad-ons. Removing the Ad-ons cured the problem. A PC is likely a different story. I hope Sophos sees the wisdom in pledging more support to this community.
Though support from Sophos here was lacking, I found the answer elsewhere. This PUA on a Mac is more annoying than dangerous. "Sophos Free" could not remove this PUA because it was in the browser ad-ons. Removing the Ad-ons cured the problem. A PC is likely a different story. I hope Sophos sees the wisdom in pledging more support to this community.