Sorry Steve,but I'm waiting for this concrete evidence from you for these mass murders,other than hearsay,etc etc.
It is hearsay lookout,but it's hearsay of eight people I can think off offhand and if I thought about it deeper I could probably come up with a couple more. It's not only the testimony of these people which depicts scant regard and malice aforethought in Jeremy's mind,it's the way he reacted after the murders with no remorse,no feelings whatsoever towards Colin,because he still thinks he's done Colin a favour by allowing him to start afresh. It's the attitude of Jeremy towards the Police interrogators where he talks in monosyllables instead of talking like a normal innocent person would do. He obviously has something to hide.
There was forensic evidence which would have tied this case up:the muddied bicycle at Goldhanger,the blood on Jeremy's shirt cuff,the hack saw marks on the outside of the kitchen window sill along with marks suggesting someone had gained entry,though Jeremy covered himself by admitting that he had used that ingress several times previously. It's just that Jeremy was never forensically examined,as DCI Edward Taff Jones had more or less staked his reputation on the case being "a domestic" and by the time Jeremy became the prime suspect most of the forensic evidence had been destroyed.