For a defined benefit scheme, the liability recorded in the balance sheet is the present value of the defined obligation at that date. The defined benefit obligation is calculated on an annual basis by independent actuaries.
Actuarial gains and losses are recognised in full in the period in which they occur and are shown in Other Comprehensive Income. Current and past service costs, along with settlements or curtailments, are charged to the Income Statement. Interest on pension plan liabilities are recognised within finance expense.