Some good news just posted on the UK government website?
All travellers
All travellers arriving into Japan from 29 April will no longer be required to show proof of a COVID-19 vaccination or a COVID-19 test result for travellers who are not vaccinated. The Japanese Ministry of Health, Labour and Welfare, and Ministry of Foreign Affairs websites have details of the entry requirements for all travellers to Japan, including the ‘fast track’ entry system. Rules may be subject to change at short notice.
