“My Lords, the word “ordinarily” may be taken first. The Act on the one hand does not say “usually” of “most of the time” or “exclusively” or “principally”, nor does it say on the other hand “occasionally” or “exceptionally” or “now and then” … I think that the converse to “ordinarily” is “Extraordinarily”, and that part of the regular order of a man’s life, adopted voluntarily and for settled purposes, is not “extraordinarily”
“… that the [discovery that a gain had not been assessed which ought to have been] was attributable to fraudulent or negligent conduct on the part of the taxpayer or a person acting on his behalf.”