‘One must ask oneself: was what the taxpayer did a reasonable thing for a responsible trader conscious of and intending to comply with his obligations regarding tax, but having the experience and other relevant attributes of the taxpayer and placed in the situation that the taxpayer found himself at the relevant time, a reasonable thing to do? Put in another way which does I think alter the sense of the question; was what the taxpayer did not an unreasonable thing for a trader of the sort I have envisaged, in the position that the taxpayer found himself, to do?’