He then pursued postgraduate studies in the History of Art at the Courtauld Institute, receiving a further MA degree from the University of London.

[6] White served as a research assistant to Theobald Mathew, Windsor Herald, and contributor to Burke's Peerage & Baronetage.

[7] On 1 July 2021, White was promoted Garter Principal King of Arms, succeeding Sir Thomas Woodcock upon his retirement.

[12] On 10 September 2022, as Garter King of Arms, White proclaimed the accession of Charles III from the Proclamation Gallery in Friary Court, St James's Palace, London[13] before a global television audience.

[14] On 19 September 2022 he proclaimed the styles and titles of Elizabeth II over her descending coffin at the end of her committal service in St George's Chapel, Windsor.