We last visited the site about 5 years ago and do not remember hearing the helicopters at all, how things have changed. From about 8 in the morning until late at night the engine noise is intrusive. It isn't so bad during the day but late afternoon and early evening it is impossible to hear the TV or radio. One night there was noise at 8pm and 11pm. This is a shame because everything else about the site fits our requirements perfectly.  We had booked to go back there next month but have changed the booking to another site.