I thought some on here may be interested in two 'new' long distance runs taking in the seacliffs here. I'm not a runner myself, but can help out with logistics if any UKCers fancy a pop at either. The seacliff climbing is pretty good as well.
https://www.gu36.com/ - 36 miles, ~1000m ascent and descent, half cliffs, half flat.
https://www.gun31.com/ - 31 miles, ~2300m ascent and descent, pure cliffs.