 | 8 Employee information | | | 2000
Number | | 1999
Number |  | | Average weekly number of Group employees during the year | | | | | | United Kingdom | | 30,200 | | 30,000 | | Overseas | | 16,400 | | 10,900 | | | | | 46,600 | | 40,900 | | | Civil aerospace | | 26,100 | | 23,900 | | Defence | | 7,700 | | 6,500 | | Marine systems | | 6,500 | | 3,500 | | Energy | | 5,600 | | 6,100 | | Financial services | | 100 | | 100 | | Materials handling 1 | | 600 | | 800 | | | | | 46,600 | | 40,900 | | | | | £m | | £m | | | Group employment costs | | | | | | Wages and salaries | | 1,388 | | 1,140 | | Social security costs | | 128 | | 95 | | Pensions and other post-retirement benefits (note 29) | | 77 | | 71 | | | | | 1,593 | | 1,306 | | 1Classified in 1999 as ‘Businesses to be disposed'. |
