Here a number of interviews with Jack Higgins are listed (chronoligical order if possible).
Title: Jack Higgins, An Annotated Checklist
Interviewer: Million - Phil Stephensen-Payne
Date: July - August 1991
URL:

Title: Jack Higgins Profile
Interviewer: The Sunday Telegraph
Date: June 1993
URL:

Title: Jack Higgins
Interviewer: Yorkshire Evening Post
Date: May 1994
URL:

Title: Jack Higgins
Interviewer: BBC Holidays Magazine
Date: May 1994
URL:

Title: Writing is Higgins' compulsion
Interviewer: newStandard - Luaine Lee, Scripps Howard News Service
Date: 1996
URL:http://www.s-t.com/daily/05-96/05-05-96/3showt.htm

Title: Passed/Failed: Jack Higgins
Interviewer: The independent - Johnathan Sale
Date: 1997
URL:

Title: The mystery of great-grandpa's tobacco
Interviewer: Daily Telegraph - Frances Welch
Date: July 1998
URL:

Title: Jack Higgins Has It MadeAnd Harry Patterson hasn't Fared Badly Either
Interviewer: WRITERS' Journal - Jack Carroll
Date: March/April 2000
URL:

Title: SEAN DILLON IS BACK!
Interviewer: HarperCollins
Date: 1999
URL:http://www.harpercollins.co.uk/authors/default.aspx?id=2627

Title: Jack Higgins
Interviewer: Readers digest
Date: 1999
URL:

Title: Higgins flying high
Interviewer: Grania McFadden
Date: April 29th 2000
URL:

Title: 'He always resented me... 'You'll never amount to much, you're useless'
Interviewer: Grania McFadden
Date: July 20th 2000
URL:

Title: Plain talking and eating Jack Higgins
Interviewer: Jane McKie
Date: February 24th 2000
URL:

Title: Jack Higgins
Interviewer: BBC
Date: 2006
URL:http://www.bbc.co.uk/jersey/content/articles/2006/03/01/jack_higgins_interview_ss_feature.shtml

Title: Merv Griffin radio show (mp3, 6.8 Megabyte)
Interviewer:Merv Griffin
Date: November 11th 1980
URL:

Title: Audio Interview with Jack Higgins (mp3, 54 Megabyte)
Interviewer: Don Swaim
Date: 1987
URL:http://wiredforbooks.org/jackhiggins/

Title: Reading and writing - Jack Higgins (mp3, 8.7 Megabyte)
Interviewer: BBC
Date: 2006
URL:http://www.bbc.co.uk/jersey/content/articles/2006/03/01/jack_higgins_interview_ss_feature.shtml