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Meet Christopher Harborne, the billionaire bankrolling Reform UK.

He moved to Thailand in the 1990s and became a Thai citizen, but he has pumped over £25 million into UK political parties, including £15 million to Reform UK and £10.2 million to the Brexit Party.

How is he legally allowed to do this?

A Channel 4 News investigation can reveal that Harborne specifically re-registered as a UK resident to cast his vote for the Brexit referendum whilst declaring just a few months later in a UK company documents that he lived in Thailand.