Hi Helen, by the sound of things France has a more user-friendly policy. However, this is rip-off Britain and many site operators are all about maximising profits. If they can find an excuse to get rid of one unit so that they can sell another, they will find it. I'm sure there are site operators who are not like this, but many are, as our research found out.
There are loads of older units around without sites, some of them looking great, but they are virtually worthless. It's the site that's worth money.