10(1)For the purpose of determining the amount of any pre-commencement supplement, a qualifying company is to be taken to have had, at all times in the pre-commencement periods of the company, a continuing mixed pool of—
(a)the relevant amount (if any) which the company carries forward under Schedule 19B,
(b)qualifying pre-commencement expenditure, and
(c)pre-commencement supplement.
(2)The pool is to be taken to have consisted of—
(a)the relevant amount (if any) which the company carries forward under Schedule 19B,
(b)the company's qualifying pre-commencement expenditure, allocated to the pool for each pre-commencement period in accordance with sub-paragraph (3), and
(c)the company's pre-commencement supplement, allocated to the pool for each pre-commencement period in accordance with sub-paragraph (4).
(3)To allocate qualifying pre-commencement expenditure to the pool for any pre-commencement period, take the following steps—
(a)Step 1: count as eligible expenditure for that period so much of the qualifying pre-commencement expenditure mentioned in paragraph 9(1) as was incurred in that period,
(b)Step 2: find the total of all the eligible expenditure for that period (amount E),
(c)Step 3: if paragraph 11 applies, reduce amount E in accordance with that paragraph,
(d)Step 4: if paragraph 12 applies, reduce (or, as the case may be, further reduce) amount E in accordance with that paragraph,
and so much of amount E as remains after making those reductions is to be taken to have been added to the pool in that period.
(4)If any pre-commencement supplement is allowed on a claim in respect of a pre-commencement period, the amount of that supplement is to be taken to have been added to the pool in that period.
(5)In this paragraph references to the relevant amount (if any) which the company carries forward under Schedule 19B are to the amount in its mixed pool for the purposes of Part 3 of Schedule 19B immediately before 1st January 2006.