A fun new e-book has been published by St John Ambulance East of England to help parents and children learn first aid together.

The free picture book, The Pen That Lost His Lid, is the next phase of the charity's recent campaign, The Chokeables, which has now been credited with saving 38 young lives.

The Chokeables - a 40-second advert which demonstrates how to save a choking baby - has been viewed more than 8 million times across Facebook, YouTube and Twitter since is launched on January 11.

The video features animated choking hazards - a pen lid, a marble and a jelly baby - who are fed up of choking babies and have to come together to teach people what to do.

In the picture book, which is available to download for free for children aged three to seven to read, Pen desperately searched for his best friend Pen Lid, who seems to have disappeared. He meets several characters from The Chokeables video on his quest, until he finds a baby who's choking. Thankfully, the baby's mum knows what to do.

Sue Killen, CEO of St John Ambulance, said: "The success of the campaign has been staggering, with over eight million views in our first few weeks, and we are thrilled that people have got behind the campaign.

"It's thanks to them spreading the word that so many people have been able to save a child from choking."