“(1) was the exchange part of a scheme or arrangements and if so what were they? (2) did the purposes of such scheme or arrangements include the purpose of avoiding a liability to capital gains tax and if so was it a main purpose?”
“unless the exchange … in question is effected for bona fide commercial reasons and does not form part of a scheme or arrangements of which the main purpose, or one of the main purposes, is [tax] avoidance”