From the latest Mail podcast it appears certain that the defence did instruct experts. My personal opinion is that they fed into some of the lines of questioning that Myers took with the prosecution experts, for example whether the rashes seen in embolism cases were the same as those seen in the trial cases. However I personally believe they didn't testify because after hearing all the clinical evidence they would have come to the same conclusions as the prosecution's experts, and would have said so under cross examination.I mean personally IMO it appears that there were either no experts willing to testify, no experts that had an opinion that would help the defence or if there were experts, they were not considered qualified enough by the court to offer their opinion. I fully believe that if BM had any experts to help the case then he would have put them on the stand. The fact there weren’t any for the defense IMO speaks volumes. But again that’s JMO.