The Pfizer version is the one that has to be stored at -70 to -80 deg C. They are shipped in batches of 975 doses (195 vials of 5 doses each) which once opened, must all be used within 3 and half days. Once reconstituted, each vial must be used within 6 hours. Although each vial is said to have 5 doses, you can actually get 6 doses from them if care is taken drawing up into syringes. They are 90% effective within 12 days of the first shot, and becomes 95% effective son after the second shot if the booster is done 21 days later. There is no evidence to say the second booster can be delayed beyond a 3 week gap, but UK are assuming it can, with no reduction in efficacy.
The Astra Zenica (Oxford) vaccine is the one that can be stored at 2-8 deg, normal fridge temp. This is the one likely to be used around the world in places where it is important to not have any specialist refrigeration. It is 70% effective 2-3 weeks after the first dose, and although intention is to boost at 4 weeks, they actually have evidence that it is more effective if that is delayed, but not beyond 12 weeks after the first vaccination.
The USA vaccine (Moderna) I believe must be stored at -20 deg, but UK will not be taking delivery of that for a couple of months yet, so I can't give any more detail.
UK are delaying all second doses until 11 to 12 weeks in a bid to get as many first doses out there as possible, starting with elderly and health care workers.
I hope an effective vaccination programme is rolled out as quickly as possible wherever you are, and that as many people take advantage of it as possible.
Chris