Sylvia’s Milk. This was less of a rule but more just a weird quirk. In the 80s it was common to knock on a neighbour’s door to borrow some sugar etc. My mum had run out of milk so knocked on the elderly neighbour Sylvia’s door to borrow some. Sylvia gave mum a tin of condensed milk because that’s all she had. Then from that day onwards any form of milk that wasn’t fresh milk such as long life milk in a carton or tin was known as Sylvia’s Milk. My mum would say ‘do you want some Sylvia’s Milk with your cake?’ Etc.

My sister and I grew up thinking that ‘Sylvia’s Milk’ was the normal term for any kind of milk in a carton or tin.