44The total activated TTH amount for a loss period is to be allocated, for the purposes of the application of paragraph 25 in relation to that loss period, to pre-acquisition accounting periods of the purchaser as follows—
Step 1
Take the most recent pre-acquisition accounting period for which there is an unused transferred profits amount which is greater than nil.
Step 2
Allocate to that pre-acquisition accounting period an amount equal to the lower of—
the unused transferred profits amount, and
the total activated TTH amount held by the purchaser for the loss period.
Step 3
Allocate to the next most recent pre-acquisition accounting period an amount equal to the lower of—
the transferred profits amount for that period, and
the available activated TTH amount for the loss period.
Step 4
Repeat Step 3 (taking later pre-acquisition accounting periods before earlier ones) until the amount given by paragraph (a) or (b) is nil.