This is not what the contract says. The contract says there is no other contract that would prevent them fulfilling the EU contract. Since the contract makes no promises about delivery schedule it’s pretty clear the U.K. contract does not prevent its fulfilment, as the U.K. contract can only delay it.

However the EU contract seems to insist the initial 300M doses are made within the EU itself, and the EU has its own dedicated supply chain regardless that can eventually deliver, so this also seems to exclude conflict with the U.K. contract.