Andy Flower, England Coach, and his west Indies counter part John Dyson has accused the Indian Premier League for interfering with the team's practice ahead of the two test series with the first begging at Lord's on wednesday.While Dyson was left fuming after skipper Chris Gayle arrived late from the IPL, Flower said Kevin Pietersen, Paul Collingwood and Ravi Bopara were "under-prepared" as they were involved in the Twenty20 league in South Africa.