[4][2] His paternal grandfather, Air Commodore E. L. Howard-Williams was a major in the army, before joining the fledgling Royal Flying Corps, the precursor to the RAF.
His maternal grandfather was Air Vice-Marshal F. F. Inglis CB CBE and head of RAF Intelligence during World War II and on Adolf Hitler's hit list.
He was sent to America by Winston Churchill where he persuaded President Franklin D. Roosevelt to direct the American war against Germany rather than Japan.
[7] He has been described as "one of Britain's most popular conductors"[8] and leads a busy international conducting career, appearing with some of the greatest orchestras in concert halls from Sydney via Tokyo, to the Concertgebouw in Amsterdam, and recording studios around the world.
[7] He has conducted six royal concerts: a dance gala with the Royal Ballet Sinfonia in the presence of Diana, Princess of Wales, two concerts with the Royal Philharmonic in the presence of the Queen and the Duke of Edinburgh celebrating the 50th anniversary of the Battle of Britain and the naming ceremony for the world's largest liner, the RMS Queen Mary 2; and two with the London Philharmonic in the presence of the Prince of Wales in aid of farmers and the naming ceremony for Cunard Line's liner, the MS Queen Victoria.
Jan's early career was in theatre, performing in the West End, before spending a number of seasons in Stratford and London as a member of the Royal Shakespeare Company.