Mairi,
It sounds as though the Hendra hasn't changed much over the years, but I stayed there many moons ago with a trailer tent and found it very busy and brash.
We found a lovely, smaller site a few minutes away from the Hendra, which was family run and was strict in that teenage groups, same sex groups etc were not allowed.
It perfectly suited my young family at that time, as well as being close to some excellent surf beaches for me.
We ended up returning year after year even after moving on to caravans, however 3 years ago we found that the site had changed ownership and the standards had dropped a bit.
Numerous vehicles were being allowed on each pitch and it seemed as if a lot of seasonal workers were being allowed use of the site.
On leaving, I complained to the company and on priciple, have not returned to see if the site has improved, but if you are nearby it may be worth popping in to check, because if it has returned to it's former standards, it is a lovely little site.
The site is now called Riverside (formerly Gwills) and it can be found by turning left out of the Hendra, taking the next left past the Lane Theatre and after about half a mile, taking a right.