Beer is really drilling down into what went on behind the scenes with the Castleton case.

In June 2006, a meeting was held to discuss the case, which Jenkins attended – he says he had “no recollection” if his duties as a potential witness were discussed then.

In late July, Jenkins was formally asked to provide expert testimony in the case.

Another engineer, Anne Chambers, did the initial analysis on his behalf, and then Jenkins reviewed the work and agreed to “front” the final report.

When she submitted her analysis, she wrote: “If this isn’t at all what you wanted, please let me know – I don’t really know what I’m doing.”

In September, Jenkins was told he wouldn’t need to give evidence in the case after all for “evidential reasons”.

He replied, “fine, I won’t try and understand what this means” – Chambers was selected as the expert witness, though Jenkins provided some further analysis.

The inquiry is told Chambers was an “extremely reluctant witness” but Jenkins says they didn’t discuss that in depth – adding he wasn’t aware of the “gory details”.