Sections 446S to 446U do not apply if the main purpose (or one of the main purposes) of the arrangements under which the right or opportunity to acquire the employment-related securities is made available is the avoidance of tax or national insurance contributions.

But instead an amount equal to what would (apart from this section) be the amount of the notional loan initially outstanding by virtue of sections 446S and 446T counts as employment income of the employee for the tax year in which the acquisition takes place.