The ingredients are already processed in various ways before they get to the factory where the ready meals are produced, which makes ready meals ultra processed food
I don't understand comments like this. What are you imagining when you write it?
From an M&S chilli, so not even 'salmon and veg' that I gave as an example
www.ocado.com/products/m-s-balanced-for-you-chilli-rice-bowl-509845011, the ingredients are:
Beef (27%), Cooked Rice Mix (17%) (Long Grain Rice, Water, Wild Rice, Sunflower Oil), Tomatoes, Water, Red Kidney Beans (9%), Tomato Purée, Onions, Red Peppers, Cornflour, Ground Spices (Cumin, Coriander, Paprika, Smoked Paprika, Black Pepper), Honey, Rapeseed Oil, Garlic Purée, Coriander, Salt, Chipotle Chillies, White Wine Vinegar, Oregano, Brown Sugar, Balsamic Vinegar, Sunflower Oil, Sugar, Acidity Regulator: Acetic Acid (which is just vinegar, before we go off on 'chemicals' so nothing you wouldn't find in your own kitchen and it has 318 calories, 7 g fat and 1.4 g salt, so less than a quarter of the recommended limit.
Is that really so high in calories, chemicals, fat and salt?