Sixpart series following 12 months in the life of Sainsbury's. Last year CEO Mike Coupe announced that Sainsbury's were trying to merge with Asda to compete more aggressively with the discounters Aldi and Lidl. Will the industry regulators give the go ahead for them to become the biggest supermarket in the country? Or will stores need to be sold?

Meanwhile, after a challenging Christmas, Sainsbury's go all out to maximize profits with their flower sales over the Mother's Day weekend. And to mark the company's 150th year of trading, they are creating a very special birthday cake to sell in store cafes across the country. The creator of Prince Harry and Meghan Markle's wedding cake has been asked to come up with a bespoke recipe. With obscure ingredients like orange blossom and rose water, can the company deliver such a complex cake on a mass scale and in time for the celebration itself?