If you're heading up The Cheviot, the tallest hill in the Northumberland National Park, then a favourite route is via Scald Hill. But Scald Hill is no tinch itself as it stands at a canny 549m high.
Best bagging is to park at Langleeford which is pretty much right at the foot of Scald Hill, and tghen head up via a well marked (and boggy in parts) path.
Follow the route above or find it on OS Maps. Just under 3km to the top with 326m of ascent.