From the time of the French Revolution in 1789 until the outbreak of the First World War, France suffered a prolonged period of internal unrest. The Revolution led to the Napoleonic Era, with more than a decade of war; this in turn was followed by the restoration of the monarchy which lasted from 1815 to 1830, when the July Revolution erupted, bringing in a form of constitutional monarchy under Lafayette and King Louis-Philippe. This survived various coups d'etat and worker uprisings until 1848, when revolutions swept through much of central Europe, and ushered in the Second Republic in France.
Given these troubles, it is not surprising that, by 1853, many French people would have sought shelter in England, as the French Huguenots had done in the previous centuries. Many famous Brits are descended from these French immigrants, such as Joseph Bazalgette, Augustus Pugin, Hilaire Belloc and the modern comedians Eddie Izzard and Noel Fielding.