Robertson’s career has spanned 14 years on the boards of major UK retailers, including previous management roles with Mars, Unilever and Alberto-Culver.
He also served for seven years as marketing director at B&Q before leading the acquisition of Screwfix Direct, which he then chaired.
Robertson also held the post of marketing director at the now defunct Woolworth before being appointed director general of the BRC in 2008.
Dharmash Mistry, a partner at Balderton Capital, is also joining as a non-executive director.
Mistry is also non-executive director at Dixons Retail. Prior to this he served on the board of Lovefilm and was group managing director of Emap Consumer Media.