These Areas correspond to the 43 police forces in England and Wales with the London Area covering the operational boundaries of both City of London and Metropolitan Police Forces. The 42 Area structure, introduced in April 1999, meets the Government's aim of developing a co-ordinated criminal justice system with national policies delivered locally. 1 Avon & Somerset 2 Bedfordshire 3 Cambridgeshire 4 Cheshire 5 London Sectors 6 Cleveland 7 Cumbria 8 Derbyshire 9 Devon & Cornwall 10 Dorset 11 Durham 12 Dyfed Powys 13 Essex 14 Gloucestershire 15 Greater Manchester 16 Gwent 17 Hampshire 18 Hertfordshire 19 Humberside 20 Kent 21 Lancashire 22 Leicestershire 23 Lincolnshire 24 Merseyside 25 London 26 Norfolk 27 Northamptonshire 28 Northumbria 29 North Wales 30 North Yorkshire 31 Nottinghamshire 32 South Wales 33 South Yorkshire 34 Staffordshire 35 Suffolk 36 Surrey 37 Sussex 38 Thames Valley 39 Warwickshire 40 West Mercia 41 West Midlands 42 West Yorkshire 43 Wiltshire