If we look at the vaccination priority groups, we can see that the vast majority of deaths come from people who fall under priority groups 1-9 - the number of covid deaths for people outside of these priority groups is small. Covid deaths should fall off dramatically once these groups are vaccinated, which should hopefully happen soon. More lives would be saved overall by vaccinating at risk people abroad instead of vaccinating people inside the UK who fall outside of priority groups 1-9.
Source -
https://c8930375-0dbb-4319-ae2f-025...d/ab45f7_a40832c6069842e6af33fcf2b06611bf.pdf
I, personally, agree with the WHO, but I think it's unlikely that we, the UK, and other 'rich' countries will ship vaccines abroad for a few reasons -
1 - People who are low risk are scared shitless over covid and are clamouring for vaccines. Only a small % will be willing to give up a vaccine, even if it means more people will die as a result.
2 - Because of this, it's politically untenable for any government to ship vaccines abroad before their country is vaccinated. Their approval ratings would fall of a cliff immediately.
3 - There is an argument that young people won't go back to normal until they get vaccinated, even if the risks from covid to them are tiny, which will cause further economic trouble that lead to more deaths.