No, the expectation was that the EU vaccine demand would be supplied by EU factories. The UK doesn't even have final manufacturing for any vaccines other than the AstraZeneca one - for the most part, our government has taken a policy of funding and signing contracts with the same factories supplying the EU and assuming they wouldn't pull some export ban stunt to distract from their own problems. (This was probably naive.) And as for the AstraZeneca vaccine, the expectation that the contracted-for doses would come from their EU factories is literally written into their contract with the EU...