Flag of the Atlantic Kingdom

Half year ago I proposed arms of the United Atlantic Kingdom covering Great Britain, France and Spain. However, the flag I created only recently. It is inspired by this Flag of the Iberian Empire, but upper red stripe is changed to French blue. Blue, white and red are British colors anyway, so this tricolor is universal. Three lilies symbolize three crowns united (British, French and Spanish), but I don't know how it could happen. Naval jack of the Atlantic Kingdom is here.

Official name: United Kingdom of Great Britain, France and Spain
Unofficial names: Atlantic Kingdom, United Kingdom, Great France
Capital: Paris
Main language: French
May and may not include: Scotland, Ireland, Portugal, Catalonia, Wallonia, Alsace