The UK Times has the report, saying the third shot is to be offered in Autumn (Fall).
The third shot is said to be aimed at reducing threat of infections spreading ahead of the Christmas holiday season. Trials are progressing, with two options:
- using vaccines specifically modified to tackle new variants
- using one of the three versions already in use: Pfizer-BioNTech, Oxford-AstraZeneca (AZN.L) or Moderna
Reuters have more here