For those who are interested, The Mentor is now showing on Discovery Real Time (Channel 250 on Sky).  Wednesdays at 10pm from 10 January 2007. Repeated on Fridays at 6pm and Sundays at 7pm.   

Lisnavagh features in Episode 8 (i.e. end of February 2007)

I understand that this is basically the same programme that went out in October 2005 but with an extra few minutes at the end to bring things up to date a year later.