The EU also hadn't approved the vaccine when those stockpiles were exported, and it was to compensate for UK domestic production shortfalls which the EU suffere

The EU also hadn't approved the vaccine when those stockpiles were exported, and it was to compensate for UK domestic production shortfalls which the EU suffered from a few months later due in large part to the Commission delaying the contract. The UK got precedence because they were first in line and the EU couldn't yet use the vaccines.