The practice of contact tracing is nothing new, but smart phone apps are now revolutionising this indispensable process aimed at reducing the spread of infection. Two types of contact tracing apps have been proposed during COVID-19, centralised models that are held on central servers and decentralised models that rely on encrypted messaging on phones to maintain privacy. The UK's National Health Service is producing its own app that, unlike the interface supported by Apple and Google, will be stored on a centralised server, enabling the NHS to link tracking data with user's identities and medical records. If using a decentralised model the NHS would be left with no way to link the tracing data to a named patient in their system and would therefore not be able to accurately map the spread, not knowing if contact tracing led to an effectively isolated patient, a false positive or even further spread of the virus. People that use smart phones are not the kind of people that really care all that much about their privacy, if they were they wouldn’t use service like Facebook that use and sell their data, this will therefore not be seen as a major infringement of privacy if it can effectively curb the virus.