Permission to see the site should be sought at Llwydarth Fawr B&B on the B5111 near Llanerchymedd, but park at the dishevelled farm house nearer to the stones.
Go through two gates, then right through another gate, follow the hedge to the wall and it's in the corner of the next field.
The burial chamber is collapsed and covered by thorny gorse. No wonder no one's been here before me. They either couldn't find it or left in a bad temper. Not me though. I was quite charmed. More intreresting was the throne stone, 50 yards away (maybe the reason for the chambers position).