2 Staff costs

  2008
£m
2007
£m
Wages and salaries 4.9 4.5
Social security costs1 0.2 (0.3)
Pension costs 0.5 0.3
  5.6 4.5

1 Included within this amount is a credit of £0.6m (2007: £1.3m) relating to the release of the National Insurance accrual recognised on share-based payments. The accrual is re-measured at each reporting period on the basis of the intrinsic value of share-based payments.