Will,

Careful at the 3Ps. I'm a marathon runner (and cross country, too) by upbringing. 3P is about 6 miles longer than Pendle but there are only 2 very steep ascents on Whernside and Ingleborough, both are draining. The danger I found was in the temptation to over-do the easy running section after PyG to Ribblehead, then get tired on Whernside and get exhausted on Inglebugger.

I ran Pendle more sensibly in 3:36 than I ran 3Ps which took me a disappointing 4:45. It's worth your while looking at the Pendle results and comparing names across to the 3Ps.