(1) The article focuses on SPI-M (SAGE subgroup on modelling epidemic spread). However, Gov't took advice on NPIs (social distancing, school closures, etc.) from SPI-B - the part of SAGE that, you're guessing it, focuses on *behavioural* interventions.
(2) Their documents suggest split positions over what measures to suggest, and focus on public reactions, rather than effects.
(3) To be clear, this is the kind of advice they were asked to provide *by* the COBRA team. The remit of expert advisors in these contexts is always limited, as is time. They do not advise on things they are not asked for.
(4) The Gov't seems to have been primarily interested in the maintenance of public order and compliance (and, worryingly, keeping schools open to allow people to continue working). The absence of recommendations for social distancing needs to be understood also in this context.
(5) The 'knowledge base' for these recommendations was and is narrow (as SPI-B recognized) and gives limited grounds for inference: for instance, there is no way to know that the way the public reacts in Japan is going to be similar to the way the public reacts in the UK.
(7) More about this (and other stuff) in an article @LinseyMcgoey and I are writing at the moment, so you'll hopefully get to read all about it soon!
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