The clarification came after the All-Party Parliamentary Group on General Aviation (APPG-GA) wrote to the Chief Executive of the CAA highlighting the need for more accessible information beyond the original complicated legal documents.
https://www.flyer.co.uk/caa-releases-clearer-guidance-for-pilots-on-covid-19/
https://publicapps.caa.co.uk/docs/33/CAP%201913%20Exemption%20Guidance.pdf