Sense about science (https://senseaboutscience.org/) campaigns on similar issues to this site.  They have recently written to the prime minister asking for a “fresh approach to scientific advice” . In particular, asking …

• you could ensure that SAGE’s minutes, membership, and plans for its expansion are open  for people to see, as so many are urging. (Sense about Science works with many different communities and I can assure you this is not an esoteric concern of the research world).
• the Chief Scientific Adviser could publish his advice.
• the government could separately explain its policy.