(Reuters) – England must stop their players from participating in the Twenty20 Indian Premier League (IPL) to improve their test side, former South Africa coach Mickey Arthur said on Wednesday. England’s test squad came under criticism after they lost the five-test Ashes series 4-0 against Australia, a result which led to the departure of head coach Chris Silverwood, batting coach Graham Thorpe and managing director Ashley Giles. Arthur, who joined English county Derbyshire as head of cricket after stepping down as Sri Lanka coach late last year, said county cricket is not to be blamed for Eng…