In the Disney case though the offer was based on upon existing prices. So yep, whilst comical that there's barely any difference in price, there's no question of the accuracy of the advert.
Literally calling something Unlimited, saying no further words are needed, but it possibly turning out that actually yes further words are needed because it may be far from Unlimited if it only lasts an hour, starts bringing in a level of dishonesty. Such dishonesty in advertising would head towards false or misleading advertising, which brings us into the realm of the Consumer Protection from Unfair Trading Regulations
, which protect from:
The Consumer Protection from Unfair Trading Regulations mean you cannot mislead or harass consumers by, for example:
including false or deceptive messages
leaving out important information
using aggressive sales techniques
Similarly, if it turns out the WiFi issue isn't true, then that's another issue.
Simply no business should be operating in a way where adverts could appear to be deceptive, and UK law is very clear in that.
I've highlighted this issue from Thorpe Park, but I've seen a lot of questionable adverts from across Merlin, including a recent Merlin Annual Pass advert
that said things you can do this weekend with your annual pass and showed a series of roller coasters that were of course in parks that are closed. I just cannot understand why this essentially dishonesty is a thing. Especially when they have previously been in trouble with the Advertising Standards Authority for similar things
Edit: more Merlin bad advertising
. An advert for an event that finished yesterday.