The Ulster Unionist Party , the Progressive Unionist Party , and the Ulster Democratic Party instead attended a special meeting at the UUP headquarters .
The Ulster Unionist Party , the Progressive Unionist Party , and the Ulster Democratic Party instead re-entered the talks on Wednesday .
The Ulster Unionist Party , the Progressive Unionist Party , and the Ulster Democratic Party instead attended a special meeting at the UUP headquarters , and re-entered the talks on Wednesday .