The primary signal is desiredSize on the controller. It can be positive (wants data), zero (at capacity), negative (over capacity), or null (closed). Producers are supposed to check this value and stop enqueueing when it's not positive. But there's nothing enforcing this: controller.enqueue() always succeeds, even when desiredSize is deeply negative.
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They are handled by the UK-wide Vaccine Damage Payment Scheme (VDPS), for which Crawford has carried out medical assessments since March 2022.
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