4

In any case where—

a

in any accounting period a company incurs a loss in activities (“separate activities”) which, for that or any subsequent accounting period, are treated by virtue of subsection (1) above as a separate trade for the purposes specified in that subsection, and

b

in any subsequent accounting period any of its trading income is derived from activities (“related activities”) which are not part of the separate activities but which, apart from subsection (1) above, would together with those activities constitute a single trade,

then, notwithstanding anything in subsection (1) above, the amount of the loss may be set off, in accordance with section 393(1), against so much of its trading income in any subsequent accounting period as is derived from the related activities.