A large number of other countries have launched apps and we have been in close contact with a number of these countries to share what we are learning. We have been working in collaboration with other app development teams across the world - including Ireland, Germany, Italy, Denmark, and New Zealand to exchange ideas. This includes sharing information on download rates and other information on how apps are being used as tools in the response to COVID-19.
Like the United Kingdom, many countries are working on solutions that best support local systems while taking into account cultural and societal differences, and ultimately each country will have to adapt its approach to digital contact tracing to its own local context, including integration with its own test and trace programme.
The success of a contact tracing app will depend on a multitude of factors, including public trust, the reproduction number (R) of the country, and societal context.