There are some significant points above by grahame, and I would like to see the evidence alluded to.
For convenience, below are better images of the first sides of each log than the images linked to earlier in this topic.


. . . the first log that had been accepted and confirmed at trial.
What evidence at trial confirmed Pc West's log?
. . . I also remember the occupants of car CA5 saying when they overtook Bamber he was driving very slowly.
Is there a transcript or statement detailing this available, especially the identification of CA5 rather than CA7? The car that overtook JB's car was certainly hurrying to the scene, so JB's speed was simply estimated. Any "normal" speed would seem slow in comparison to the likely speed of car CA7.
. . . CA5 turned up much later at the scene. In fact 40 minutes later.
Consistent with travel from Chelmsford as distinct from Witham.
. . . The discovery of the second log was the first they had even heard of car CA7.
Do you mean a car identified as CA7? Pc West's log refers to two cars, but identifies only one of them.
. . . In fact the for you read both documents you see more so called mistakes. Yet they only mention one seeming mistake . . .
Can you correct the first sentence, which is misworded, and explain what people you are referring to as "they"?
I do understand all that Bridget and it is quite reasonable to speculate all that. But unfortunately the only concrete evidence that we have to go on are the logs themselves.
Even if they're not "concrete" evidence, we should at least consider the statements made later by Pc West and Malcolm Bonnett.