The Zeitgeist of the 1980s was that a small clique knew how to run this country,they often as not spoke with plummy accents and had an air of credibility and efficiency about them,when we know from experience that this often wasn't the case. Both DCI Taff Jones and Julie Mugford were outsiders to the Home Counties culture and faced with a personage such as Jeremy Bamber who played his part so well he remarked to Julie the first chance he could "I should have been an actor",the head of investigation was fooled and White House Farm was not treated as a crime scene. Although this was undoubtedly a serious affair as you say I still think that had Sheila in a state of psychosis killed five people with 25 rounds of ammunition there would be some trace left for investigators to link to her upon entry and not the ambiguity which remains to this day.
Dear Steve,,,you should have been a politician. Why.? Because you evaded my questions.
The someone speaks is down to their environment and it really shouldn't be an issue in a murder investigation. Yes,,Jeremy spoke differently,,but that's all part and parcel of being well-bred,,and there are a lot of people who don't like that for some unknown reason. Possibly their ignorance.
There is plenty to link Sheila to the crimes,,but nothing to link Jeremy,,except the way he spoke.