NSPCC - the NSPCC's sexting pages

Childline - NSPCC's Childline: support for young people

Childline's Zipit app: an app used to diffuse awkward situations when asked to send nude selfies.

Internet Matters: a not-for profit organisation providing guidance to keep young people safe online.

ThinkUKnow: The CEOP website with guidance for young people, teachers, parents and carers.

Vodafone Digital Parenting: an online magazine providing guidance to parents about helping young people stay safe online.

02 Device Safety: O2 provide guidance on how to keep your technology safe for young people.

NSPCC Share Aware: NSPCC's site describing the most commonly used apps by young people.

Internet Watch Foundation: an organisation that searches out unlawful images of children online and requires them to be taken down.

Parents Protect: Set up by the Lucy Faithful Foundation and Stop It Now

Stop It Now!: Guidance for protecting children and advice for those at risk of harming children.

Lucy Faithful Foundation: an abuse prevention website.

UK Safer Internet Centre: an organisation promoting the safe use of technology by young people.

UK Council for Child Internet Safety (UKCISS): A group of over 200 organisations working together to help keep children safe online.

Southwest Grid For Learning: A not for profit charitable trust supporting schools and other establishments.

Respect Yourself: Guidance for young people created by the Southwest Grid For Learning

Healthy Respect: Guidance for relationships

Disrespect Nobody: A government website discussing sexting, consent, relationships and porn.

Sussex Police have created a great page with a couple of really good videos around taking and sending nudes.