As you said, arranged! And people were kind "encouraged" to spend for the very reason of making motorhome owners look good, if not, great! So
not "real world". And of course, people had been stuck at home, so they had money to spend. That is not the normal spend. And you failed to say how many motorhomes! 10 and £400 each? 100 and £40 each or 500 and £8 each.
Take a look at almost any forum involved with motorhoming. very many want stopovers away from others, how do they spend? Ones that will only stop free in towns, how much will they spend? Even pub stopovers are getting fed up with people staying and not using, and sometimes even going into the pub! And don't forget the old adage, there are lies, damn lies and statistics!