Nigel Farage adviser had unpublicised role at polling firm

A close adviser to Nigel Farage had an influential role at a national polling company, despite not being publicly associated with the firm.

Chris Bruni-Lowe, Farage's private pollster, played an important role in the operations of Redfield & Wilton Strategies, according to sources.

The revelation comes amid ongoing questions about the influence of data and polling in politics.