It is quite hard to find where to ask permission for this one. Though if looking to ask permission find the house that sells eggs. We found the adventure centre and went to ask there, was no-one about so we drove to left and left up a lane parked outside a ladies house after asking permission, she was lovely. We then made or way up over fields but ended up in the adventure centre land. The owner arrived in a pick up truck. He was nice to us but said he doesn't want anyone up there and neither does his father. ( i can understand why he doesn't want people in the centre as if kids and groups are there it wouldn't be appropriate.
You could get up via the fields beside it but then they are all owned so access is a slight problem. Linkback: https://mountainviews.ie/summit/1225/comment/21513/