[RWD version 1 ] Onzy's route description for his Track 2177 is as terse as his route is efficient: "Quick up and down taking in Benbrack and its NE Top" he says.
I need to take a bit longer because I ended up getting off to a very poor start which requires an explanation.

Onzy walked here 12 March: my walk was 24th December.
Onzy started at 14.20pm: I started at 7.25am
Onzy's distance was 7.8km, mine was 8.8km.
We both parked at H11700 24567 (the right place)
Onzy turned west and walked about 150m or less along the road before turning onto a farmer's track at H 11544 24582. That was the right thing to do.He completed his route in 1 hour 59 minutes.
I left my parked car in the pitch dark and headed east along the road searching in vain for the farmer's track that was clearly indicated on my OSI Map.. Eventually I opted to go through a gate thinking that this "must" lead to the relevant track. It didn't!
No I did not have a torch. And worse, my super duper Garmin Oregon 200 was not telling me where I was on its little map as it turns out that this spot is where its "North West" map peters out ( a "Here be Dragons" mapping moment to be sure). If I had done my homework properly I'd have followed Onzy's route. Instead I walked into what can only be described as a series of well concealed SWAMPS. On more than one occasion I stepped off dry land and began to disappear into a sink hole. It was a nightmare.By the time I found the higher (mountain) end of the farmer's track, dawn was breaking and I continued on my way without difficulty: but I was but a shadow of my former self.
Result. I completed my route in 2 hours 55 minutes.
It took me an hour longer than Onzy.
And the moral of the story. Don't leave the safety of a road in the pitch dark without a torch. And make sure you enter onto a track rather than a swamp.
This route requires very little ascent but quite a long slog over difficult ground.