Full 8 figure grid ref (from English Heritage scheduling) = SS13624372
I'm really annoyed that I didn't find this because it's the only chambered tomb on the island. Although the English Heritage directions say "165m north east of Rocket Pole Pond", at this point I couldn't find it (!) and was wondering if it was covered in one of the pockets of bracken that inhabit this area of the west side. When I got home I realised that the 8 digit grid ref places it actually only 20m south and 20m west of the Tent Field Fives Stones Monolith; which I had found (SS13624372 & SS13644374). Shame I didn't realise this at the time. I suspect that either the EH directions are wrong (North north east maybe?), or the grid ref of one of the sites is wrong.