Andi, I tend to have my 610 set to 0.25 mile splits rather than the default 1 mile - since I've changed it I can usually manage within 5 seconds per rmile over several miles as I get 3 chances to modify my pace after seeing it per mile. I'm useless at pacing myself without the watch!
If my legs recover I'm almost thinking of running the Buxton HM on Sunday - Eyam on Sunday was great (1:54:54), calves feeling destroyed now and still can't walk downstairs. Views were magnificent and well worth entering just for those. http://connect.garmin.com/activity/314879829if anyone is interested in seeing the profile correlating to speed (or lack of it!)