Spot the Ladybird - your help needed

I'm often asked to help someone identify a dearly remembered book from the odd line or description of a picture.  Often I can do it - but this one may be a bit modern for me.  Can anyone help?

Ladybird Books have often played around with the idea of kids being able to spot something small hidden on each page, but what could this be?

I'm thirty years old and have recently had my first child. My mum and I are 
trying to track down a book from when I was very young but we can't remember the 
title. We just know that on each page there was a hidden ladybird to find. We we 
wondering if you might know which book this is. 

Hope someone can help