I was just coming to say exactly this. The live feed reporting sort of misses the importance of the peptides and the insulin (I’m sure in court it was clearer though) so I’m really grateful that we’d had such a detailed and clear explanation of how it works before we heard the evidence being presented.
Ben Myers KC, for Letby's defence, explains on this count [for Child F], Dr Gibbs will not be asked any questions on his evidence.
He adds that Dr Gibbs will be cross-examined on a future occasion in the trial on evidence that has been raised.

so they’re not questioning anything Dr Gibbs has said today, and her defence accept “The doctor says this insulin result showed Child F had been given a pharmaceutical form of insulin administered, and he "should have never received it".”