There are many preventable diseases in the world that don't get vaccinated for. In some countries basic drugs like antibiotics are not available to all the population. Even basics like clean water, education, freedom from girls as young as 11 being married to men 3 or 4 times their age.
Before the UK or any other country pauses its vaccine programme to assist other countries these very basic inequalities need to be addressed. They never will be, because of corruption in those countries. Whats to say we pause the vacccine, people who would have gotten the vaccine continue to get it and get ill, maybe not seriously ill but its still a drain on the economic recovery, still frightening and still a risk for long covid. Meanwhile, we've diverted supplies to other countries where the most vulnerable are ignored to vaccinate the wealthy. It will happen in some countries, we can't even guarantee foreign aid will go to the right place.
The UK stumped up billions to have us in this position. If we continue to fund research and production as tax payers we should at least have the privilege of having the vaccines. If individuals feel differently they can always decline.