If you go to the three peaks website there are links to the results (on the sportident site). Here's the link for 2012 - http://results.sportident.co.uk/home...0-05a7e8049b02 If you find a finisher with a 4:45 time then click on the details link and you'll get the splits for the tops as well as Ribblehead and the Hill Inn.
Unless you know you pace yourself in the same way as another runner then mile splits might not be of much use.