Nestlé boss Dame Fiona Kendrick promises it will manage Brexit costs responsibly and look after 'well-loved brands' KitKat lovers can eat happy in the knowledge that the chocolate bar will not be downsized to cut Brexit-related costs. Dame Fiona Kendrick, Nestlé's boss in the UK and Ireland, said the four-fingered version of the much-loved biscuit bar would not be reduced to three to lower costs.