Change the rules so that any over 18 willing to have the vaccine for Covid has the opportunity to be free to travel this summer by allowing their second vaccine to happen after 4 weeks not 8. Why should they be disadvantaged when there are still plenty of people who don’t want vaccinating at all.
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Enable every adult the same opportunity. Currently those who are last to be vaccinated simply can’t have two jabs if they have to wait 8 weeks in between. They may also wish to travel to amber countries or be part of a family travelling where others have had two or are under 18.