Nigel Farage faces a huge fine or even imprisonment, after failing to declare hundreds of thousands of pounds worth of donations.
The Ukip leader received £205,000 worth of donations-in-kind for the use of an office near Bognor Regis.
Under electoral law, donations must be declared to the Electoral Commission within 30 days.
Farage's undeclared donations date as far back as 2001 but were only declared last month.
The Ukip leader now faces the prospect of a maximum £20,000 fine or even a prison sentence.
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