Lady Diana Spencer weds the Prince of Wales

Prince Frederick Louis was the eldest son of King George II and Queen Caroline of England. In December 1728, Frederick, as heir to the British throne, now honored as Prince of Wales, arrived in London for the first time from Hanover at the age of twenty.
In 1736 Prince Frederick married Princess Augusta of Saxe-Gotha.
Sarah Churchill, Duchess of Marlborough, tried to arrange a marriage between her granddaughter, Lady Diana Spencer to Prince Frederick.
Suppose Prince Frederick Louis marries Lady Diana Spencer. What happens then?
 
Prince Frederick Louis was the eldest son of King George II and Queen Caroline of England. In December 1728, Frederick, as heir to the British throne, now honored as Prince of Wales, arrived in London for the first time from Hanover at the age of twenty.
In 1736 Prince Frederick married Princess Augusta of Saxe-Gotha.
Sarah Churchill, Duchess of Marlborough, tried to arrange a marriage between her granddaughter, Lady Diana Spencer to Prince Frederick.
Suppose Prince Frederick Louis marries Lady Diana Spencer. What happens then?

England and Hanover are parted sooner rather than later, given the marriage would be morganatic for Germanic purposes.

EDIT: As her grandfather was a sovereign prince of the Holy Roman Empire the marriage probably wouldn't be morganatic.
 
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England and Hanover are parted sooner rather than later, given the marriage would be morganatic for Germanic purposes.

EDIT: As her grandfather was a sovereign prince of the Holy Roman Empire the marriage probably wouldn't be morganatic.

Nah, Marlborough was a maternal grandfather, so it's still morganatic. Given that this is Britain the early 18th century, there might be a bit of leeway - laws of equality got more stringent and lawsuits became more frequent as the century went on - but if we assume that Freddy is barred from Hannover, that puts Britain on a more splendidly isolated basis vis-a-vis the continent. The new ruler of Hannover is William 'the Butcher' of Cumberland. He might be made Viceroy of Hannover before his father dies, which could take him away from the '45, but wouldn't change the outcome of the Rising. Presumably, Cumberland marries some Princess (doesn't matter who, really) and has kids. However, if he doesn't, that puts Hannover in an interesting position: will the Brandenburgers be accepted as Electors of a polity whose founder they are not descended from?
 
Nah, Marlborough was a maternal grandfather, so it's still morganatic. Given that this is Britain the early 18th century, there might be a bit of leeway - laws of equality got more stringent and lawsuits became more frequent as the century went on - but if we assume that Freddy is barred from Hannover, that puts Britain on a more splendidly isolated basis vis-a-vis the continent. The new ruler of Hannover is William 'the Butcher' of Cumberland. He might be made Viceroy of Hannover before his father dies, which could take him away from the '45, but wouldn't change the outcome of the Rising. Presumably, Cumberland marries some Princess (doesn't matter who, really) and has kids. However, if he doesn't, that puts Hannover in an interesting position: will the Brandenburgers be accepted as Electors of a polity whose founder they are not descended from?

Actually I think it would require closer inspection of the Brunswick house laws: it'd be a mismarriage, probably not morganatic since the Duchess was angling for a secret wedding - presumably the Prince and Lady Diana wouldn't needlessly renounce her rights since the Marlboroughs and Spencers would have every desire to argue that she was equal (noble in all quarters).

From what I'm seeing online the Brunswicks required equality only as of 1840, so perhaps it was not an issue at this point.
 
Even if the marriage is morganatical Frederick himself isn't barred from ruling Hannover, only his children are.
 
Even if the marriage is morganatical Frederick himself isn't barred from ruling Hannover, only his children are.

Morganatic mismarriages seem to, at least on occasion, have entailed the immediate loss or curtailment of the higher ranked partner's rights too.
 
The children of Frederick Louis and Diana:
Prince Richard Charles George
Princess Caroline Anne
Prince Robert Henry Frederick
Princess Sarah Sophia Dorothea
Prince Augustus John
 
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