To click on any particular Add button for a particular product you can write a method as follows:
def click_me(string):
driver.find_element_by_xpath("//h3/a[@class='co-product__anchor' and contains(@title, '%s')]//following::button[1]" % (string)).click()
Now you can click on any of the Add button passing their title as follows:
click_me("Munch") # Munch Bunch Double Up Strawberry & Vanilla Yogurts
# or
click_me("ASDA") # ASDA Greek Style Fat Free Yogurt
# or
click_me("Petits") # Petits Filous Apricot, Strawberry & Raspberry Yogurt
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