Our trip is mid to late August.
The issue is it has taken Disney a long time to offer the same deal to UK guests as it did it US, so I imagine they would have discussed how pretty much all of us come with a 14 day ticket - (some have a 21day) and although we get the same message to say about no gaurentee.. nothing about the fact we will be limited in the amount of days we want to use of our ticket. So right now no indication we cannot use 14 days - whereas everything else has been covered.
What I am saying is that if there is limitations for example only being able to book for 3/4 days in a row. Disney have to tell us that and they need to refund our tickets, as they are not longer 14 day tickets (not to mention everything else lost from our 'ultimate' tickets. Just like if you paid for a 3 day ticket you would expect you can visit on 3 days, we are the same.
As I say, there has been nothing from Disney that suggests we will not be able to use our tickets on all 14 days (this is different to warning we may not get a reservation for the parks we want)