Any start-up or scale-up knows that you have to keep developing your apps, and neither core functionality nor features will be perfect first time. Not surprisingly the rapidly-developed new contact tracing apps will need to go through a test and learn process, and it is not at all surprising that the UK's first attempt has hit teething problems. Maybe this will prompt a switch to a new version based on underlying Apple and Google technology, maybe not. But despite the press looking to find fault with these teething problems, it is normal for a start-up.