"Oxford" being the operative word here…
Can't rule out how much is hype, due to UK outperforming EU in vaccination rollout and that AstraZeneca is a competitor to Pfizer/Biontech, Biontech being a German company.
Brexit/EU pissing contest continuing unabated, maybe, plus I think I saw Pfizer jacked the price on their vaccine when AstraZeneca started getting those rare blood clot reports. Never let a good crisis go to waste, as they say.
Those with AstraZeneca first jab can take any other vaccine 2nd jab. Makes no difference, according to SO, who got AstraZeneca 1st jab. What does that tell you?