There is also forensic evidence which is nothing to do with Sheila, but links Bamber.
The bike, bathroom window, kitchen window, found hacksaw, police phone call, phone call to Julie, Bamber's answering machine, Bamber sleeping 'like a log', an (unseen) available route to WHF, the massacre time, the previous caravan break in, etc.
All of which supporters can dispute. But as the judge said 'several curious coincidences'.