If you can identify any countries that are lacking in this area, feel free to cite what they have / have not done and criticise them accordingly, but you cannot criticise the UK in this area.
I don't blame individuals such as yourself but there can surely be no denying that the best overall strategy would have been to give just two doses of vaccine (preferably a viral vector dose plus mRNA dose) around 3 months apart worldwide and for any booster doses to be given out only to immunocompromised people until there was no longer any supply issue.
Of course we don't have the benefit of hindsight and can't turn back the clock; also the trials that took place with 3 week gaps arguably had to have such a short gap because we needed the data quickly.
I strongly suspect this is not the case if you are measuring efficacy against severe disease, hospitalisations and deaths and if the comparison is with two doses of viral vector and mRNA vaccines with an optimum gap between them.
However if you look at the data from (say) Israel where they gave 2 x mRNA doses only 3 weeks apart, then yes you are going to get a very different result with the boosters.
For the average person, with a lengthy gap between doses, a booster really isn't required - and that is the opinion of experienced virologists not just myself - however my advice on an individual level would always be for anyone to take what is recommended to them.
Absolutely and people have no right to lump the UK in any criticisms in this regard; to do so demonstrates a lack of understanding.
The website is:
https://www.nhs.uk/conditions/coron...rus-vaccination/book-coronavirus-vaccination/
However you cannot have your 3rd dose until 6 months after your second dose; once 5 months has elapsed it should allow you to make a booking.
Don't forget, a longer gap between doses provides a broader, longer lasting immune response.