Like I said, each tourist destination will, in the absence of a national scheme, create their own version. My guess is that only hotels will be included in the first round of schemes as they register all guests so it's easy to use an existing system. In the EU I'm sure that developed schemes include campsites, we've certainly paid tourist taxes on campsites, however Aires users may not get charged but I could be wrong.What about New Dover Road P+R which has had MH facilities for 10 years plus, to my knowledge and usage?
I estimate that there are far more visitors per day to Canterbury than the hotels can account for - just look at the numbers arriving on coaches.