A GMC-registered GP — the same doctor who requested them, wherever possible — reviews every result personally. Nothing is automated and nothing is signed off unread.
The review is interpretive rather than mechanical. A result inside the reference range is not automatically fine: a ferritin of 20 is technically "normal" and is nowhere near enough for someone with hair loss or exhaustion, and a thyroid result at the edge of range means something different alongside positive antibodies. Those distinctions are the entire point of having a doctor look rather than a system flagging outliers.
You get a written explanation and, where there is anything to discuss, a conversation about what happens next.