but user, we never ate convenience food in 1970s
Really, it just didn't exist in the same way. Most people ate meat and 2 veg cooked at home, or chips from the chippy. The huge range of ready made foods available today is new.
Big supermarkets didn't exist either, they were smaller, and in our local Sainsburies you queued at the meat counter, then the veg counter, then the cheese counter etc.
so in 1970 there was no, or very few, or not readily available, or not eaten regularly:
pasta as a regular daily food (apart from tinned spaghetti)
pasta sauces
cook in sauces
ready made pizzas
ready made microwaveable meals (no microwaves)
MacDonalds/Burger King etc
ready made treats like samosa, onion bargies, chicken nuggets
pretty much the limit to ready made was
baked beans/tinned spaghetti
tinned chicken/meat pie filling
spam
fish fingers
It is hard for anyone raised post late 1980s to realise how much we eat today wasn't there, or was too expensive