He previously held senior roles at BT's infrastructure division Openreach, HSBC and Procter & Gamble.
His father was an aeronautical engineer who had worked at de Havilland, and had married Alegra Mizrahi in 1959.
He joined Dixons in 2001, initially as Marketing Director at mobile phone retailer The Link.
In addition to his £885,000 salary, Garner also receives a £292,000 pension allowance, a £1 million bonus and £500 a day to cover the cost of travel, security and medical expenses.
[9] In April 2020, Garner was one of the first CEOs in the financial services sector to take a salary reduction and forfeit his bonus in light of the coronavirus crisis.
[11] On 23 September 2021, Nationwide announced that Garner had asked the Board of the Society to start the process of finding his successor as part of an orderly transition.
[17] [18] On 5 Feb 2024 Garner was appointed by the Cabinet Office to the committee responsible for recommending proposals for a permanent memorial and legacy programme to remember Queen Elizabeth II.