19= Sir Keith Mills
Loyalty Cards, £160m
Sir Keith Mills, who organised the Invictus Games and was the deputy chairman on the organising committee for the London Olympics, was born in Brentwood. He made his money from loyalty cards
— first Air Miles taken over by BA in 1994 and later the Nectar card which he sold in 2007 netting £160m. He recently settled a claim against Coutts Bank where he had £73m of his wealth tied up in AIG bonds, and had been seeking £8m in damages. His other assets include around £2m of company assets and a recent £2.5m investment in video messaging app Wordea. We value Mills at £160m for now.