So, let’s get to the beef of this comment. Professor Laxon? New Years eve party and he likely had a few drinks too many and fell down a stairway...end of story.
The dog-walker, Doc Boyd, was just plain unlucky and got in the midst of a thunderstorm....getting hit by lightning.
Finally, this Dr Giles was on a bike in the middle of London and got hit by a passing truck. On an average day...probably a dozen people in London are mysteriously hit by trucks as they ride a bike or scooter around town.
If this was a Rockford Files episode...he’d likely be there for six weeks figuring out the angle to each one, and the only link was just plain bad luck or too much booze.
Why are you walking your dog in a thunderstorm? I remember walking in a lightening/thunderstorm carrying a metal object...so I handed it to my helper without a word.
Bad stuff can happen. Wadhams had one too many bottles of Newcastle.