LONDON (Reuters) – Britain’s Eton College, the alma mater for many of the country’s elite including King Charles’ sons, said on Wednesday it had been forced to delay the start of term because of a risk of flooded sewers. The around 1,350 pupils at the country’s most exclusive boarding school, located by the River Thames near Charles’ Windsor Castle, had been due to return on Tuesday but recent heavy rainfall meant the sewers would not be able to cope. “Following extensive flooding in the region, the Thames Water sewers which serve the town of Eton flooded,” the school, whose alumni also includ…