Other parts of the network include regional Special Branches and other special units.

Scotland
Police Scotland.

North East
West Yorkshire, Cleveland, Durham, Humberside, Northumbria, North Yorkshire, South Yorkshire.

North West
Greater Manchester, Cheshire, Cumbria, Isle of Man, Lancashire, Merseyside.

Wales
South Wales, Dyfed Powys, Gwent, North Wales.

West Midlands
West Midlands, Staffordshire, Warwickshire, West Mercia.

South West
Avon & Somerset, Devon & Cornwall, Dorset, Gloucestershire, Wiltshire.

East Midlands
Derbyshire, Leicestershire, Lincolnshire, Northamptonshire, Nottinghamshire.

Eastern
Bedfordshire, Essex, Hertfordshire, Norfolk, Cambridgeshire, Suffolk.

Counter Terrorism Command (SO15)
Metropolitan Police, City of London Police.

South East
Thames Valley, Hampshire, Kent, Surrey, Sussex.

Northern Ireland
Police Service of Northern Ireland.