I've just realised, that fell is within Open Access land so the place will be riddled with paths and sheep trods on the ground which won't be shown on the map (High Rigg is similar - loads of visible paths on the ground once you're there but nowt on OS maps, a little more on the open street mapping which google satellite uses).
So yeah, turn up. Set off. Head uphill on whatever path you find until you get to the top
Oh, black dashed lines on OS maps (1:25k) are boundaries of some sort, not paths. Fainter black/grey dotted lines are paths on the ground which aren't rights of way (sometimes they are overlaid with the green RoW lines though).