Considering the old "third world" phrase is no longer in use, I assume you mean the new meaning of "third world" - i.e. country where leaders are incompetent, pedophiles and liars, whereas footballers have to beg the government to put food on the table for millions of kids. So it makes me wonder, why the hell do you need vaccines to visit "third world" England? Vaccines to stop you spreading your false statements? If yes, that's not how it works.
Remember, robbing, bombing other countries for more money and still having poor people wnho cannot feed their kids even when the country gives so many benefits, now that is a third world!