"Allan C, although Great Britain did not become a political entity until the Act of Union in 1707, it existed as a geographical entity"

Of course it is also a geographic entity but that isn't the point. James claimed the use not as a geographic entity but as a political entity even drawing up the designs for flags etc. The Stuarts also claimed to be monarchs of France - so what Royals claim doesn't always equate with reality. Likewise the current website for the monarch is at best down right confusing for people. It gives the monarchs of England and Scotland up to 1603 then lists the rest as monarchs of the United Kingdom which is simply incorrect. On the said website only the English numberings are used. Hence James Stuart who became deposed is listed as James II of the United Kingdom when in fact he was James VII of Scotland and the James II of England. Likewise William of Orange is listed as William III of the UK when his titles were William III of England and William II of Scotland.