The U.K. has promised doses to Covax,I don’t think it’s delivered them. ??
I see that said a lot and am not sure I understand it. There are 2 ways of donating to Covax, cash and vaccines.
Cash - the G7 spurred more countres to increase their cash donations giving Covax double the previously promised donations and more ability to order vaccines. Which they have done and have been delivering for 3 months, 45 million doses and counting
Vaccines - when a paying country's population is vaccinated to whatever degree they set, any remaining paid for vaccines will be diverted. Those additional vaccines haven't been manufactured yet, though more are being made daily. So there is no current surplus to send, from any country.
That's how Covax was set up
By joining COVAX, both self-financing countries and funded countries will gain access to this portfolio of vaccines, as and when they prove to be both safe and effective. Self-financing countries will be guaranteed sufficient doses to protect a certain proportion of their population, depending upon how much they buy into it. Subject to funding availability, funded countries will receive enough doses to vaccinate up to 20 per cent of their population in the longer term. Since demand is initially likely to exceed supply once vaccines do become available, allocation will be spread across countries based on the number of doses that are available and increase as that availability increases.