International travel, is one matter- as sunny dave said to me, there are already some requirements, so this might be another. But international travel isn't generally essential (as isn't NHS staff "having" to).
I have had the first one, for work, as I decided to. And just to hopefully reassure anyone who gets the same- i had absolutely no fluey side effects, of temperature, shivering, fatigue- but did get some skin itching, which is apparently ok and just a different side-effect.
I will never agree though, that any individuals should be manipulated, forced or heavily persuaded to have medical treatment, on the potential behalf of other people. Each to their own- and much as i would love everyone to get vaccinated. Proper consent is essential.