Spot you mention. We had planned to stop there about 2 summers back. There is a hight barrier, which did not pose a problem for our pop top roof.
It is a nice beach, used to sit out there when building Torness nuke station. We moved on because, there were lots of empty beer bottles and tins scattered about, then about 4pm police car did a drive by, so I put two and two together and came up with the fact, I reckon this is a drinking spot for local youth/boy racers, so we moved further south. Judgement call really, it could work out ok if you stay over, can get under the barrier??