Please see this CAA Safety Notice.
This has been published following CAA consultation with GA stakeholders (through the GA Partnership, in which GAAC participates) since early March.
As part of the easing of Covid restrictions in the coming weeks, from the 29th of March GA flying for non-professional purposes for solo pilots, or individuals flying with a member of their household or bubble, can resume.
It is currently planned that from the 12th of April flight training for all pilots, and flights with an instructor, can resume. The full updated guidance is available on the DfT website here.