UK based guided running websites.
JelleyLegs. Guided running in Yorkshire http://www.jelleylegs.co.uk/ and link to an interesting piece about guided running holidays in The Guardian...
http://www.guardian.co.uk/travel/2011/sep/30/guided-running-holiday-north-yorkshire-dales
RunSnowdonia. http://www.runsnowdonia.co.uk/Default.aspx with blog entry about running in Mallorca http://sarzmountainrun.blogspot.com/2011_04_01_archive.html