Little Darlings by Sam Llewellyn
Primrose, Cassian and Daisy Darling are very bad children. Papa Darling and Mrs Darling (the children's mum scarpered long ago) both know that child-rearing is a task best performed by experts, not parents. Unfortunately, the Darling family nannies never last long, for quite obvious reasons. Enter Nanny Petronella Fryer - Nanny Pete - in a Jag XJS. Nanny Pete is different. There's the stubble for a start. And she lets them eat anything they want - no more burnt custard or lumpy porridge. They're all about to embark on what can only be called a comic caper, which leads the little Darlings far from home on a cruiseship full of burglars - and ultimately to their own missing mum.