Well that's why I couldn't find it, you said Waitrose! :D
Anyway in that salad you linked to look at all those ingredients. If you want something as nice at home you need a lot of stuff!!
Cannellini Bean and Sesame Tahini Dip (21%) (Cannellini Beans, Water, Tahini (Sesame Seed Paste), Lemon Juice, Garlic Purée, Salt, Rapeseed Oil), Cooked Quinoa (16%) (Water, Quinoa Seeds), Edamame Soybeans (14%), Black Beans, Cooked Spelt (Water, Spelt (Wheat contains Gluten)), Soy and Ginger Dressing (7%), Broccoli, Carrots, Green Beans, Rocket, Peanuts (1.5%), Pumpkin Seeds, Almonds, Pistachio Nuts, Coriander, Lemon Juice, Soy and Ginger Dressing contains Sunflower Oil, Sugar, Concentrated Apple Juice, Ginger Purée, Rice Vinegar, White Wine Vinegar, Salt, Lime Juice, Concentrated Pomegranate Juice, Red Wine Vinegar, Cornflour, Soybeans, Wheat (contains Gluten), Red Chilli Purée, Garlic Purée