Here's a site with six verses of God Save the Queen/King; plus an extra one from Canada. And it links to a page with seven verses; plus numerous versions in Chennel Island French.

I think they seem to have started using this fourth verse at State Occasions, as second verse in a two verse version, which seems a friendly idea -

Not in this land alone,
But be God's mercies known,
From shore to shore!
Lord make the nations see,
That men should brothers be,
And form one family,
The wide world over.