30. Contingent liabilities
(a) The Group has provided, through the normal course of its business, performance bonds and bank guarantees of £51.4m (2007: £37.9m).
(b) Further consideration may be due, dependent on certain performance criteria, on acquisitions completed by the Group in 2005 up to a maximum of £0.3m.
(c) Further consideration may be due, dependent on certain performance criteria, on acquisitions completed by the Group in 2007 up to a maximum of £21.9m.
(d) Further consideration may be due, dependent on certain performance criteria, on acquisitions completed by the Group in 2008 up to a maximum of £17.0m.