Hundreds of medics and health scientists plus thousands of citizens have signed support for the declaration on day 1: https://gbdeclaration.org/ 
The thinking behind it is laid out here for anyone who would like to join the call for a more considered approach: https://unherd.com/2020/10/covid-experts-there-is-another-way/

“Current lockdown policies are producing devastating effects on short and long-term public health ... with the working class and younger members of society carrying the heaviest burden”. So they say let the healthy and young free to build protection for the shielded vulnerable.

The approach of ‘focussed protection’ is supported by many scientists and they have no conflict of interest. Epidemiological studies supporting the approach are cited in this thread: https://twitter.com/mgmgomes1/status/1312859248817250304