NotSpaghetti
I remember olive oil from the chemist Dickens! It was very expensive.
Yes it was!
I also remember having to purchase it from the Chemist - must've been in the 60s
"The oil extracted from olives, called olive oil, or salad oil, is, with the continentals, in continual request, more dishes being prepared with than without it, we should imagine. With us, it is principally used in mixing a salad, and when thus employed, it tends to prevent fermentation, and is an antidote against flatulency." 
- from Mrs Beeton's Book of Household Management, published in 1861
I'm now growing olives in my garden and conservatory (in the winter months). But 'curing' them is a faff, according to my son who lives in South Africa and has spent hours doing it.