With (Sir) Nigel standing down to enjoy his retirement having achieved his lifelong ambition, who is going to succeed him as leader of the party that is known for now as UKIP? They'll have to have been a member of the party for five years, ruling out household names such as Suzanne Evans, Raheem Kassam and Arron Banks. Whoever it is, they have some pretty big boots to fill. Bring it on 
