Is it correct that there was no forensic evidence ?
Bamber's footprints and fingerprints will be all over the house. He was a regular visitor. Either sneaking through windows to look at wills, or popping over for supper and a rabbit massacre. So no possible joy for the police here.
Bamber had a month to dispose of clothes. Even so John Hayward found human blood on Bamber's jacket, bathrobe and in his car.
There is the bible that landed on top of Sheila's blood.
There is Sheila's legs being pulled after she had been shot.
There is the time scale the judge mentioned - 3.26am - 3.48am. It is impossible for Sheila to have committed the massacre in this time.
There is the fact that no one can explain how Sheila committed the massacre, which matches the forensic crime scene.
The crime was committed by Sheila or Bamber. There is a lot of forensic evidence (20 points) showing it was not Sheila, which has been posted several times. Which automatically shows it was Bamber.
June being shot with her head on the pillow is forensic evidence pointing to Bamber rather than Sheila.
The twins not waking is forensic evidence pointing to an execution, rather than a long term crazy woman episode.
There is the silencer evidence.
There is the found hack saw which Bamber admitted using to get in and out of WHF. But apparently not on the massacre night.
There is the discovery that the kitchen window could be banged shut from outside.
So the answer to the question is -
There is forensic evidence linking Bamber to the crime.