What is the national slogan of united kingdom?

Answer 1

'God save the King' (Queen when a Queen regnant is on the throne) Scotland uses 'Flower of Scotland' Wales uses 'Land of my fathers' and England uses 'Jeruselem' Other unofficial British anthems include 'Rule Britannia' and 'Land of hope and glory'
God save The Queen.

Answer 2

I suppose you could say that the official motto of the British Monarchy, "Dieu et mon droit", is a kind of national slogan.

It is written in French and means "God and my right" (a fuller version translates as "God and my right shall me defend") and it refers to the divine right of a monarch to rule. It is written in French because at the time that it was adopted, the official language of the Royal Courts was Norman French (after the Norman invasion in 1066).

"Dieu et mon droit" is also written on the Royal Coat of Arms.

Answer 3

God in my right