I'm going to be honest with you here. Of course he could have gone out and bought a light and attached it to the bicycle if we are going by the gulity narrative.
The evidence reference the transport though as it stands are Vauxhall Astra, a ladies bike without a headlight, and walking
The transportation of this crime is left to speculation. Whether it be me you, relatives ,cps, DDP ccrc, Essex police, man and his dog
You say the " successful prosecution case is he used a bike" not strictly true. None of us were on that jury and the transportation could have been anything. They knew he drove. They knew he had legs and feet.
But then ask yourself this. If bamber had used the bike. He could have disposed of it on the return journey. And then walked the remainder to goldhanger.
Lots of nooks and crannies about. If he used the bike he would want to get rid of it. He could have cycled to WHf and then walked back which would give the impression ( if gulity ) that June's bike was just at WHF and he had never used it.