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Congratulations @MattHancock and @matthewsgould Great technical work by @NHSX to deliver @NHSCOVID19app . Here are some suggestions around the 'soft stuff' of getting massive buy in required to make it a success. 
1) Use SMS Cell Technology to send a link to every mobile phone in the country. Start in hotspots to avoid overwhelming the system.
2)Urgently provide the digitally excluded a cheap but App-friendly smartphone. Internet access is a basic human right. Nobody left behind.
