Drone over Cemlyn

The Guardian newspaper reported concerns in France about drones flying over nuclear power stations.
Someone was flying one over Cemlyn this afternoon.
These are becoming popular. Cadw are posting videos they have taken over Welsh castles and monuments.
But they are a bit intrusive and certainly frightened away birds in the area this afternoon. Not the quiet walk expected either with the constant buzzing noise up in the air.
What are the flight regulations about flights over nuclear power stations in the UK?

Drone flying over Cemlyn beach