Section 46 shall not apply—
to a quoted option to subscribe for shares in a company, or
to a traded option, or financial option, or
to an option to acquire assets exercisable by a person intending to use them, if acquired, for the purpose of a trade carried on by him.
The preceding provisions of this section are without prejudice to the application of sections 44 to 47 to options not within those provisions.
In this section—
"financial option", "quoted option" and "traded option" have the meanings given by section 144(8), and
"quoted shares or securities" means shares or securities which are listed on a recognised stock exchange ... .