The defendant was charged with causing Death by Careless Driving. The prosecution relied, almost entirely, on reconstruction expert evidence to position the vehicles relative to each other in the seconds leading up to the collision. Our instructing solicitors asked us to consider the expert evidence and to comment upon it and produce a defence report. A careful scrutiny of the prosecution expert’s calculations and conclusions took place and we were able to show that they were potentially unreliable and that, ultimately, the prosecution hypothesis was flawed. After a lengthy trial at Crown Court, the defendant was acquitted of the charge. We were praised by counsel who commented, ‘I only fire the bullets, it is the expert (Mr Mason) who provides the ammunition’. High praise indeed.