These are Lovehearts, our version of Sweethearts.
They're hard candy with a bit of a fizz to them. Very sweet. They're available all year round and include slogans like 'Sis' and 'Mum' as well as 'Call Me' and 'You're Sweet'. They're not considered a valentines day treat, and are mainly to be found in the sweetie bags of small children for whom the slogans are very giggleworthy.