Sch 15 para 32
(1) The “special allowance amount” for an accounting period is the amount of a special allowance made under section 164 of CAA 2001 (general decommissioning expenditure incurred before cessation of ring fence trade) for that period. (2) A special allowance amount is attributable to the TTH oil field so far as the expenditure in respect of which the allowance is made is expenditure incurred on decommissioning plant or machinery brought into use for the purposes of oil-related activities carried on wholly or partly in direct connection with the field.