Speaking to someone in a pub in Valentia the previous evening I was reliably informed that the locals pay scant regard to the discouraging signage at the entrance to the service road. So the next morning, humming "Break The Law" by judas Priest, I drove up the road and parked at the transmitters, about 1.5 kilometres from the summit. Heading left around the fence I picked up a distinct track that led east over a broad bleak ridge. The summit is a featureless grassy rise, with neither cairn nor trig pillar.
I returned via the same route making a round trip of about 1 hr 20 minutes. A hill that's easier to walk than to pronounce. Linkback: https://mountainviews.ie/summit/849/comment/17575/