I know for a fact that if this was fanfiction, these corrections would destroy the entire plot and plot twist of the episode.
1) The hospitals don’t really give out neck collars anymore unless the neck muscles are that unstable.
2) If the neck muscles were that unstable or the whiplash had been that bad, he’d have been told to take he week off. Even if he tried to do work, he’d have the choice between being in pain upto 11, rendering him useless, or being on strong painkillers rendering him equally useless.
Either way, he definitely would not be able to run. He wouldn’t even be in work to need to run.
That’s just lazy, ITV. Very, very lazy.