Colonel Humphrey Mews was Deputy Private Secretary to which member of the British royal family?
Charles, Prince of Wales
Title: Charles, Prince of Wales
Passage: Charles, Prince of Wales (Charles Philip Arthur George; born 14 November 1948) is the eldest child and heir apparent of Queen Elizabeth II.  Known alternatively in Cornwall as Duke of Cornwall and in Scotland as Duke of Rothesay, he is the longest-serving heir apparent in British history, having held the position since 1952.  He is also the oldest person to be next in line to the throne since Sophia of Hanover (the heir presumptive to Queen Anne), who died in 1714 at the age of 83.
Title: Humphrey Mews
Passage: Colonel Humphrey Mews (1941-1990) was Deputy Private Secretary to His Royal Highness the Prince of Wales 1986-1988.
Title: Edward Young (courtier)
Passage: Edward Young, CVO is the current Deputy Private Secretary to Queen Elizabeth II.  He received his promotion in September 2007 after the promotion of Christopher Geidt from Deputy Private Secretary to Private Secretary, on the retirement of Sir Robin Janvrin, former Private Secretary, 1999–2007.
Charles, Prince of Wales Humphrey Mews