According to the latest government data, more than 669,105 people have now had their second dose of the vaccine.
More people reported side effects after the second dose of the vaccine, possibly indicating a stronger immune response.
To bring figures to the picture, 14 percent of people reported side effects after the first jab compared to 22 percent of people who reported side effects after the second jab.
Overall, women tended to be more likely to report side effects than men in the study (19 percent Vs 13 percent respectively), and it was the under 55s who suffered more greatly.