sender

The app is marketed as a fully end-to-end encrypted messaging service - meaning only the sender and recipient of a message can read it - like WhatsApp and Signal.

However, the sender, a detective sergeant in the Met’s Diplomatic and Parliamentary Protection unit, included the recipients’ names in the CC section of the email, rather than BCC, which would have concealed their identities.

And if I can hazard a wild guess, I don’t think the senders really wanted me to have a great day.

Messages and images on Snapchat disappear after 24 hours - making incriminating behaviour harder to track - and senders also know if the recipient has screengrabbed a message.

Contact the sender through known channels, not the suspicious message.