He said it looked like they could have formed a suicide pact but he could not be sure "beyond all reasonable doubt".

BBC: The car involved in the investigation

"The prosecution say that Mr Cowan fits that profile perfectly, and the prosecution say that you can be sure - all 12 of you, beyond reasonable doubt - that Mr Cowan was the gunman, " he said.

BBC: Andrew Farndon

What all this means is that the virtues of transplanting nerve cells have yet to be demonstrated beyond doubt.

ECONOMIST: Something new in mind