ICTA88/S785A addresses avoidance involving the sale of income
streams.
If a lease income stream is received it is, of course, taxed.
If it could be disposed of in a way that that does not attract tax
(perhaps because the receipt is within the scope of the chargeable
gains legislation and the gain is covered by costs or losses) tax
would be effectively avoided.
Section 785A addresses this issue by bringing the
consideration received for the disposal of the income stream into
charge as income.