I haven’t had any issues with subs, and, although there are Waitrose items I miss, i have found some new things from M&S I really like.
Love from M&S range the following - bao buns, mangoes, chicken karaage, pikelets, Oakham mini breast fillets (very tender), vintage Cornish cruncher, readymade shortcrust pastry, flapjack cookies, salt and pepper pork belly joint, rainbow stir fry mix, cod fillets, potato croquettes.........
Other things from Ocado - in general their wide range - love being able to buy pillows or oven tongs or birthday gifts with my shopping! Or very unusual ingredients /spices for new recipe.........
Particular things/ ranges - crosta & mollica (apricot croissants, white bread, flat bread all fab), brindisa ( olives, salsa brava I use as pasta sauce, chorizo), packington pork ( esp bone in joint), epicure (anchovy paste, flageleot, grapefruit ), Picard, Stokes sauces, east end spices, Black farmer, Tony’s chocolate.
Hope this gives some ideas 😁