I have a copy of Delia Smith's Cookery Course Part One (1978, accompanied the BBC televisions series of the same name) and one of the recipes I use from it is for pizza dough. It's striking that even then Delia felt the need to explain what a pizza was:
One of the nicest ways of eating bread is as a 'pizza' - freshly-baked bread dough with delicious fillings melting and bubbling on topLet's not dwell on how a filling could be on top of anything, and instead remember the times: olive oil was for clearing out your ears, peppers were for foreigners, avocadowhato, rocket was for going to the moon. We used to make nutritious food out of what we had: now we have everything and make nothing, and all the processed food we buy is made of poisons and held together by glue. If you can buy local and fresh, that's the best food you can get.