“62. ‘Special circumstances’ therefore means something more than circumstances that are simply unique or particular to the individual taxpayer. The correct test, therefore, is to determine whether the circumstances are ‘out of the ordinary, something uncommon’”
“ 53. …Plainly [‘special circumstances’] must mean something different from, and wider than, reasonable excuse, for (i) if its meaning were confined within that of reasonable excuse, paragraph 9 would be otiose, and (ii) because paragraph 9 envisages a reduction in a penalty rather than absolution, it must be capable of encompassing circumstances in which there is some culpability for the default: where it is right that some part of the penalty should be borne by the taxpayer. 54. They [i.e special circumstances] must encompass the situation in which it would be significantly unfair to the taxpayer to bear the whole penalty.”