A quick Google search of "Covid vaccine" this morning, and things looking fairly positive on that front e.g. Fauci cautiously optimistic of one in place in the USA by the end of the year, among other similar timeframe stories.
In an unusual piece of UK government planning, we've already bought millions of doses of the Oxford university one, but I wonder if how it'll be administered has been given any thought. Also the administering of it presumably will be a devolved matter?
I imagine they would start with the oldest people and work down from there. But I wonder how long it would take to get through the whole population? I have zero knowledge of this, but in Scotland's case, I'd think a couple of months to get through us all?