In a letter to Siobhain McDonagh, MP for Mitcham and Modren, and seen by the Standard, Sainsbury’s retail and operations director Simon Roberts said: “Despite the £100 million investment, the number of legacy contracts we have in our system means that this is still not enough to ensure that every colleague is better off because of the existing variability in our contracts. We fully understand that some colleagues will be impacted by the proposals.”