Main contribution
Endocrinology evidence on the two insulin counts (Babies F and L) at the 2022–2023 trial.
Conflict-map · Trial prosecution experts
Prof. Peter Hindmarsh
Crown's insulin expert
EndocrinologyProsecution claim1Court/official
Key claim
Low insulin-to-C-peptide ratios were diagnostic of exogenous insulin administration.
Criticism
The GMC opened a fitness-to-practise investigation into Hindmarsh on the same day he began giving evidence at the Letby trial in late 2022; the medical tribunal concluded the allegations 'may have the potential to impact on his ability to act as an expert witness' but the jury was never told. Hindmarsh removed himself from the GMC register through voluntary erasure on 14 November 2024, ending the investigation without a regulatory finding. Independent clinical biochemists (Ismail, Chase, Senn) have separately argued the Roche immunoassay used at trial was not forensically validated and that confirmatory mass spectrometry was not performed.
Related evidence
Conflict-map topics this expert participates in
- Insulin and C-peptide
Cross-reference on the main experts conflict-map page.
- Crown insulin expert's GMC investigation — non-disclosure to jury
Cross-reference on the main experts conflict-map page.
Full biographical profile
Other experts on the same side
Trial prosecution experts.