(Adds quotes, official statement, changes dateline) LONDON, Oct 21 (Reuters) - Ian Drake, the man who has presided over a golden era for British Cycling, will step down as chief executive in April, the governing body announced on Friday. British Cycling has also been dragged into the controversy surrounding Team Sky's use of Therapeutic Use Exemptions (TUEs), including for former Tour de France winner Bradley Wiggins. More...