MILLER V MINISTER OF PENSIONS  All ER 372
That degree is well settled. It need not reach certainty, but it must carry a high degree of probability. Proof beyond reasonable doubt does not mean proof beyond the shadow of doubt.The law would fail to protect the community if it admitted fanciful possibilities to deflect the course of justice. If the evidence is so strong against a man as to leave only a remote possibility in his favour which can be dismissed with the sentence "of course it is possible, but not in the last probable" the case is proved beyond reasonable doubt, but nothing short of that will suffice.