Do you have to download the new NHS coronavirus track and trace phone app?

manchestereveningnews.co.uk:

coronavirus contract-tracing. Following months of delays, the app is now available and the public are being urged to download it in order to help control the spread of coronavirus.The app is free to download, for anyone aged 16 and over, and once installed will automatically notify the user if they have been in close contact with someone who later tests positive for coronavirus.The idea is that the user, if they become unwell, they can input the details into the app, which should then be able to determine a person as a close contact.But is it compulsory and do we have to download it?The short answer is no as the app is entirely voluntary by the user, however, the success of the contact-tracing via the app will depend heavily on how many.