We don't really know that Brexit will be successful at all! Vaccines aside it is going pretty shit at the moment.
We are small and insignificant compared to the might of the EU and we need to start getting used to it.
jas I agree with some of what you say. However at no point have the UK stopped the EU making AZ vaccines. The UK had to put something like this in place because we are there country and we needed to ensure that our citizens got the vaccine. You can see that the EU (unsuccessfully) in their contract tried to ensure that they would get their full supply even if that meant us getting no supply.
The difference in anger between the EU and India is very understandable. We were never supposed to be getting vaccines from India. That was additional supplies that didn't quite work out. The EU are trying to take the vaccines that were always meant for UK people.
We have not yet fully vaccinated all the vulnerable.
Once we do, then perhaps we can think about export. But we are nowhere near that place yet.
I do hope that even if the EU are daft enough to stop Pfizer exports that we don't retaliate by blocking Croda exports.
I doubt Pfizer would ever have accepted an EU first contract as they has signed with US many months before so would not be able tonsupy others. Uk I think we're 1st to Pfizer deal so again we already had a contract.