Just found these sites today. I hadn't seen an interview with him for a long time & couldn't remember what he sounded like. A lot of the interviewers on this thread describe his accent as South African. I disagree, it only slightly sounds like them and has more of a British sound to it.
1st one is WS speaking briefly about Blue Horizon:
http://www.meettheauthor.com/bookbites/48.html
2nd one is WS speaking again briefly but about The Triumph of the Sun
http://www.meettheauthor.com/bookbites/637.html