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Why would it have taken over a year to charge the driver?
So many factors that could have contributed to this, but lack of police capacity, difficult detective work, lack of evidence, etc. are usually the main ones.
Why are the circumstances so mysterious?
That's simple: No witnesses (apart from the driver) or video recordings.
Why has the driver only been charged with death by careless driving?
Lack of evidence, undoubtedly. I've said before that I think these categories should be replaced by better ones, but here the prosecution was probably not confident of being able to prove that the driver was driving far below the standard expected of a competent driver. I think it's difficult to show this without video or witness evidence. It's not too difficult to show that his driving fell below the standard expected of a competent driver, but many prosecutions have failed because of the increased difficulty of convincing a jury that the standard of driving fell far below that of a competent driver.
Finally an update on this; 60 year old Clifford Rennie charged with causing death by careless driving, next hearing is Oct 14th.
https://www.bucksfreepress.co.uk/news/19531792.court-hearing-man-accused-causing-deaths-cyclists-a40-takes-place/
I still have a horrific fascination for this case given it happened so close to my house and I go past the scene nearly every day. Why would it have taken over a year to charge the driver? Why are the circumstances so mysterious? Why has the driver only been charged with death by careless driving? 2 people were killed in cold blood but no-one seems to really give a shit :(