Yorkshire Vikings Southern Division Essex Eagles Glamorgan Gloucestershire Hampshire Hawks Kent Spitfires Middlesex Somerset Surrey Sussex Sharks Three division format Northern Division Derbyshire Falcons Durham Lancashire Lightning Leicestershire Foxes Notts Outlaws (Nottinghamshire) Yorkshire Vikings Central Division Glamorgan Gloucestershire Northamptonshire Steelbacks Somerset Birmingham Bears (Warwickshire) Worcestershire Rapids Southern Division Essex Eagles Hampshire Hawks Kent Spitfires Middlesex Surrey Sussex Sharks Winners Finals day has been held annually towards the end of the English cricket season. Performance by county References English domestic cricket competitions Twenty20 cricket leagues Sports leagues established in 2003 Recurring sporting events established in 2003 Professional cricket leagues Professional sports leagues in the United Kingdom NatWest t20 Blast