We did. There are often threads on here claiming that in the 70s everybody ate healthy plain food cooked from scratch. Utter nonsense. Some people may have done, we didn't. My Mum cooked when she had time and took shortcuts when she didn't. God alone knows what was in some of the things we ate.
Anyway, sandwich spread is not just in discount stores. Ocado stock it. https://www.ocado.com/products/heinz-sandwich-spread/10641011 Just added a jar to my basket. Always loved it. When I was training as an accountant decades ago, we were sent on courses to prepare us for our professional exams. They were held in a hall attached to a synagogue in West London and the caretaker's wife made sandwiches we could buy at our breaks, to go with the polystyrene cups of instant coffee, nasty soft drinks in unnatural colours, crisps and chocolate biscuits they no doubt bought from a cash and carry. The sandwiches were made with white sliced bread and a limited range of very cheap fillings, one of which was sliced hard-boiled egg and sandwich spread. That was my favourite and I still have it sometimes now.
The ingredients of sandwich spread make it look like a health food besides the Angel Delight listed above!
Spirit Vinegar, Sugar, Cabbage, Rapeseed Oil, Carrots, Gherkins (contain Firming Agent, Calcium Chloride), Modified Cornflour, Onions, Salt, Egg Yolks, Red Peppers, Mustard, Stabilisers - Guar Gum and Xanthan Gum, Spice Extracts, Spices, Herb Extract (contains Celery), Flavourings, Colour - Riboflavin, Vegetables 34%