“… the omission to do something which a reasonable man, guided upon those considerations which ordinarily regulate the conduct of human affairs, would do, or doing something which a prudent and reasonable man would not do.”
“… the question whether a taxpayer has engaged in negligent conduct is a question of fact in each case. We should take the words of the statute as we find them and not try to articulate principles which could restrict the application of the statutory words. However, we accept that negligent conduct amounts to more than just being wrong or taking a different view from the Revenue.”