Advice for parents about talking to your child about creating, sending or receiving explicit images:
http://www.nspcc.org.uk/help-and-advice/for-parents/talking-about-sex/sexting/sexting_wda96795.html

Report Remove:

Report Remove helps young people under 18 in the UK to confidentially report sexual images and videos of themselves and remove them from the internet. Click the link below to find out how Report Remove Works.

Support for parents and carers:
https://www.childnet.com/parents-and-carers

Advice about smartphones, gaming devices, tablets and other internet-connected devices:
https://www.saferinternet.org.uk/advice-centre/parents-and-carers/parents-guide-technology

Child Exploitation Online Protection  (CEOP) Centre website for parents and carers:
https://www.thinkuknow.co.uk/parents/