Telegraph: A noise monitoring report commissioned by Cuadrilla showed that sound levels during drilling peaked 20pc higher than allowed.
But the report said other "local activity' was probably to blame - as spikes were also seen when it was not drilling - and suggested that protesters and police may also have led to increased noise.
Planners at West Sussex County Council said it was not clear "whether there has been a breach of condition' and that they had pressed Cuadrilla to quieten their operations...