"In the very olden days a Macowans penny chew had to be cracked on the kerb and half given to your pal. Though mouths were smaller and pavements softer in the seventies"
Ah, yes McCowans Highland Toffee. Almost guaranteed to pull several fillings out. Also risked breaking a tooth if one attempted to "chew" on a cold day / before warming said toffee in mouth prior to mastication.
Twenty "new pence" could get you one of the above, a pack of sweet cigarettes (or some shredded coconut tobacco), and a Marvel comic ( Doctor Strange, Fantastic Four or The Incredible Hulk in order of preference), with maybe some "new pence" to spare, maybe in half penny coins: felt like you had more left over. Of course you could blow (literally) the rest on some Bazooka Joe bubble gum (with free mini-comic inside) or maybe a Sherbet Fountain/Dip Dab.