The single biggest known British political advertiser on Facebook is a mysterious pro-Brexit campaign group pushing for a no-deal exit from the EU. The revelation about Britain’s Future, which has never disclosed the source of its funding or organisational structure, has raised concerns about the influence of “dark money” in British politics.

A BBC Spotlight investigation into the man behind the DUP's record £435,000 donation during the EU referendum has uncovered a trail of illegal activity and foreign money.

The Brexit deadline is hurtling towards us, and citizens across the UK still aren't allowed to know who bankrolls the politicians deciding the country's future.