LONDON (Reuters) – Australian entertainer Rolf Harris was charged in a London court on Monday with 13 child sex offences, dating back to the 1980s, as part of an investigation which has led to the arrest of more than a dozen celebrities. Harris, 83, arrived at Westminster Magistrates Court with his wife and was released on conditional bail after the hearing. He was committed for trial at Southwark Crown Court where he is due to appear on October 7. His lawyer indicated he would be pleading not guilty, according to the BBC. …