From the Association of British Orchestra:
We are delighted to announce that the ABO and other stakeholders have been able to secure an exemption from quarantine regulations for professional performing artists travelling to the UK and for those returning from activity overseas (who have upcoming work commitments). Legislation will be laid in parliament and the exemption will come into force from 4am on Saturday 5th December.
Arts Council England will be publishing guidance shortly on how the exemption will be applied.
This exemption will apply initially to England only. Its extension to Scotland, Wales and Northern Ireland will need ministerial approval from their respective governments.