Documentary going behind the scenes of Sainsbury's. After a challenging Christmas, the staff go all out to maximise profits with their flower sales over the Mother's Day weekend. Plans are also made to sell a birthday cake to celebrate the company's 150th year of trading, bringing in Claire Ptak, the creator of Harry and Meghan Markle's wedding cake, for ideas. Plus, last year CEO Mike Coupe announced a possible merger with Asda. Will industry regulators give the company the go-ahead to become the biggest supermarket in the country?