In reply to The Connor-Crabb:
I've stayed on quite a few caravan and camping club sites and they seem to close reception at 8pm. With a parking area for late arrivals, which works for vans I guess, but not for tents. But then 90% of their business is caravans and vans.
Never tried turning up late, but to my mind if any business says it closes at 8pm you shouldn't expect to get access after that time. I wouldn't in a shop or restaurant.
If they have decided that's how they want/need to operate and are willing to accept some lost business that's up to them.
I could understand that some site owners want to welcome/vet customers on arrival, due to rowdy/problem groups ruining other guests stays, and also don't want to be hanging around until 10pm every night and not being able to have a social life