Happy, happy knitters from a Woolworth's advert, 1970s. "Strong yarns, wool yarns, nylon yarns. Yarns for babies, grannies, families, Winfield yarns, the best yarns".
The lady with the huge bag of wool seems to be knitting something white and tiny for a baby, whereas granny is creating a huge, stripy blanket. Or maybe it's one of those freeform jumpers for a grandchild that 1970s grans used to excel at. The ones where the sleeves went on for around a third longer than they should have done. The ones that barely fitted over your head.
Bonus points to the photographer for capturing gran's classic Carry On expression, and double bonus points with chocolate topping for taking the picture just as the bus was going past a Woolworth's store.
If you're a fan of 1970s knitwear, keep an eye out for second-hand copies of Woolworth's Knitting Magazine, which is a treasure trove of brightly coloured acrylic knitting and crochet patterns.