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In OTL, on the 6th of November, 1817 Princess Charlotte daughter of Prince Regent George (later became George IV,) died of an 'undetected post-partum haemorrhage' after giving birth to a stillborn child. This led to the rapid marriage of Prince Edward to Princess Victoria Saxe-Coburg-Saalfeld, their child was Princess Victoria (who later became Queen Victoria.) Also Charlottes husband, Prince Leopold of Saxe-Coburg-Saalfied went on to marry Louise-Marie and had 4 children, he also became King Leopald I of Belgium.
But what if instead of dying after giving birth to a stillborn child, Princess Charlotte actually gave birth to a child, let's say a boy in this case, and survived and called the boy Leopald. We now have a line of succession through George's daughter, meaning there'd be less need to marry any of Charlottes uncles of. So in 1830 King George IV dies and the Crown of the United Kingdom goes to Princess Charlotte, who's healthy and becomes Queen Charlotte I. Also the Crown of Hanover goes to George's brother, William who becomes William I of Hanover.
What would be the changes in this scenario to both the UK and Hanover? Obviously we will have a personal union of Belgium and the United Kingdom so how would this pan out? Obviously later Ernest Augustus would still become King of Hanover, but how would the UK react to a Leopald I?