Yvonne Griffiths, who is a neonatal unit manager at the Countess of Chester, is first in the witness box today. She's giving evidence on Total Parenteral Nutrition (TPN) bags and how they are stored at the hospital

The jury are being shown a photo of the treatment room at the Countess of Chester where medicines and kit was stored. Ms Griffiths is explaining that there was one set of keys for a refrigerator that stored controlled drugs

She says that there wasn't a system for accessing the fridge, if a nurse needed anything they would just ask for the key

Jury is now being shown images of the inside of the fridge, Ms Griffiths says insulin was stored in there

A medicines requisition booklet from summer 2015 is now being shown to the court - this was used by nurses to request more stock. We're being shown an entry from June which shows there was a request for a babiven maintenance bag

Ms Letby's defence lawyer Ben Myers KC is now questioning the witness. It's clarified that the treatment room wasn't locked and was open to doctors and nurses 24/7

Neonatal nurse Kate Bramall has just been in the witness box. She was on shift when a TPN bag was delivered to the unit for Child F. She was asked if she had ever added anything to a bag. 'No, it's not something we do', she said.

Asked if she had ever added insulin to a bag, she said :'No never' She explained insulin is administered through a separate syringe

Another nurse, who was also on shift, has just been asked the same questions. She again said she had never added anything to a TPN bag

Another nurse, Cheryl Cuthbertson-Taylor, has just been asked the same questions. Again she told the court she had never added anything to a TPN bag

Another nurse, Valerie Thomas, is in the witness box and is again being asked the same questions. She says she has never administered a TPN bag to a child or added anything to a bag

A statement from Consultant Obstetrician & Gynaecologist Simon Wood is now being read to the court. He helped to carry out the C-Section on the mother of Child E and F. He said the twins were 'born in good condition'

Expert medical witness Dr Dewi Evans returns to the witness box. He was asked to review the case by Cheshire Police and produced a number of reports on the events at the Countess of Chester

Dr Evans said there was 'only one explanation' for the 'astonishing' levels of insulin found in Child F's blood. 'These were very, very striking results. There's only one explanation for this, (Child F) had received insulin from some outside source', he said.

Dr Evans said he had concluded the drug had most likely been added to the baby's Total Parenteral Nutrition (TPN) bag, which is used to intravenously provide feeds to infants.

Ben Myers KC, defending, has no questions for Dr Evans on his evidence

Medical expert Dr Sandie Bohin, who reviewed Dr Evans' findings, is now in the witness box. She's asked if she agrees with Dr Evans that this was a case of insulin poisoning via TPN bag. 'Yes', she says

Again, Mr Myers has no questions for the witness. That concludes her evidence. Police intelligence analyst Claire Hocknell is now in the witness box, she is taking the jury through sequencing evidence

A summary of Ms Letby's police interview, carried out in 2019, in relation to Child F is read to the court. In that interview Ms Letby denied adding insulin to a TPN bag

That's it for today and that concludes evidence related to Child F. Tomorrow the court will move on to Child G. https://www.bbc.co.uk/news/uk-...