LTNman
Currently there are only two flying clubs at SEN, Seawing and Southend, based at the western end of the airfield, outside what I seem to remember from many years ago was the BKS hangar. Between them there are 12 to 15 aircraft on the aprons, not all of which are regularly flown.
There are further light aircraft housed to the north of the runway.
The CAA stats for April 2016 show there were 855 club/private movements, which equates to 28.5 per day, which probably amounts to one take off and landing per hour over a 14 hour period. I would imagine these figures also include visiting aircraft. There is also a reasonable amount of ILS and procedural training but I'm not sure if these show up in the CAA stats.
Unfortunately, long gone are the days when 4 or 5 trainers would be in the circuit at the same time and at home, hours go by without seeing a light aircraft going to or from SEN when in the past there would have been many.