The Department for Digital, Culture, Media and Sport (DCMS) have worked with the British Museum to prepare metal detecting specific guidance during COVID-19. These can be found here https://www.gov.uk/guidance/guidance-on-searching-for-archaeological-finds-in-england-during-covid-19
It provides information on what to do if you find an item covered by the Treasure Act 1996, as well as how you work with the Portable Antiquities Scheme to continue to record other coins and artefacts.
Note it also gives specific guidance on rallies and other group digs.
‘To ensure people are social distancing, the government has prohibited by law all public gatherings of more than two people. Group or club searches and rallies are therefore prohibited.’
Following announcements on further lockdown easing on Sunday 25 May we will lobby the DCMS for organised digs to be included in any further changes to lockdown restrictions.