The long ridge and the two stiles
Start at the lay-by with the broken bench. The ridge path is obvious for the first two kilometres, then splits at a stone wall with two stiles about forty metres apart.
Take the left stile. The right one leads into a field that looks like it continues along the ridge and instead drops into a farmyard with an opinionated dog. Every person who has walked this route with me has taken the right stile at least once.
Water and shelter
There is none. Bring both. The trig point is a reasonable place to sit out of the wind on its east side.