Re: NHSX devs apparently superior to Google devs
Not sure the wall thing matters that much. If there's a wall the signal may be weaker - so I appear to stand further away - but then there's a wall - so though the virus might sneak through it's less likely to - so my 'effective' distance from the other person is greater.
This is all a game of probabilities after all. The app is only really going to be useful outside family/friend groups. In those groups you are going to have personal knowledge of potential infections. In an office/factory/one to one home visit/medical etc situation good paper record keeping is probably as effective. So you are basically talking shops you spend a lot of time in (barber, tatoo parlour, comic store in the Big Bang Theory) and bus/train journeys.
Biting the hand that feeds IT
