Peter Geoghegan contends that the money was channelled to the DUP through the official Vote Leave campaign. Photograph: Andrew Milligan/PA Wire

Longford-born journalist Peter Geoghegan was sitting in a train carriage in Newcastle just before the Brexit referendum in 2016 when a quest began to (...)

Arlene Foster told the BBC in February she did not even know how much the mystery donor had given the party.  Photograph: Niall Carson/PA Wire

If Northern Ireland were a normal democracy, the election campaign would be dominated by a single question: how did the Democratic Unionist Party end (...)