In Sweden, they are called "latte pappas" – the swathes of men frequenting coffee bars with their babies who have fast become a global visual shorthand for the possibility afforded by shared parental leave. In the UK, we haven’t even reached the stage of agreeing on a name for this new breed of hands-on fathers. House husband, stay-at-home dad, daddy-mummy ("D-ummy" for short) are just some of the terms being used to describe the tentative beginnings of the UK’s own parenting revolution.