The early 70s were pre CAMRA so I I used to drink draught Guinness and the occasional Vodka and Roses Lime Juice with crushed ice.
By 1979 Young's and Fuller's had real ales as well as Brakespeares of Henley and Hook Norton ales near Banbury.
Our family visited Yorkshire in October 1975 and there were a lot of non Camera beers (Tetleys) but also Sam Smith's and Theakstons real ales.