Airlines are businesses so they can set many of their own rules, within certain boundaries; for example, they can choose to not allow on their aircraft people who are drunk. It's only a small step to see them stopping entry to their aircraft, to protect their other passengers and their staff, if you have not been vaccinated.
There is also the possibility that countries put pressure on airlines and won't allow passengers to alight if they have not been vaccinated.
Given the cost so far to countries and their economies, and the loss of life, these are not so hard to imagine.
You may think otherwise. You may refuse to have a vaccine, and, as you say, the UK government won't force you to as it's not our way, but that doesn't mean you will be allowed to board a plane or boat in future.
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