The crisps with the blue bag and the first crisps that I ever tasted. We used to sell them at my Dad's shop and they came packed in tins (picture 1, 2 = a 1920s advert, 3 = a WW2 packet, 4 = 1960's advert, 5 = 1930's serving suggestions, 6 = 1930's advert & 7 = Pattie Boyd's 60's advert):