Hello Grumpy
I thought that was my name
Anyway a bit of a reality check:-
As you will have seen from the replies, and no doubt from your own research, there is no formal structure for storage charges, basically a storage yard owner can charge what they like.
When it comes to what is offered in exchange for you hard earned money, its space to park your pride an joy. And that it. Don't expect security to mean your caravan is any safer in a enclosure unless the owner has guards patrolling 24/7 but the chances are they'd told to run a mile if confronted by thieves anyway.
If you do suffer any kind of loss the site will wash their hands of all responsibility, unless you can PROVE they have been negligent.
Sites with a Cassoa rating are supposed to meet a Cassoa's code of standards, but frankly it does't offer any guarantees. Some insurers offer a policy discount if you use a Cassoa site, but the discount doesn't cover the generally higher cost of the site.
Just in case the site you do use does claim to offer security, insist on having written statement on exactly how secure and what liability they will accept if their security is breeched.
I hope you can read between the lines....
And before anyone say's I must have have a chip on my shoulder, I do not . I've never lost a caravan form storage site, and I have no personal dispute with any site operator. I have no connection with a storage site, I just hate to see good people being exploited. and being duped into believing that Cassoa sites must be better.