Is called the "Boston Brakes". It is detailed in Sir Ranulph Fiennes book "The Feather Men".
That mode of assassination has been around for awhile, according to Fiennes.
I've also read Race to the Pole and Atlantis of the Sands, he's a fairly decent author and explorer.
He(Fiennes) also has deep ties to the military and intelligence communities. I don't doubt for a minute what he claims is fact.
I wonder if Hastings had an ONSTAR type service that might have recorded something, whether conversation or vehicle diagnostic information.