Well, specifically with UK visitors - do you mean visitors staying on WDW property as resort guests are down, or do you mean UK visitors passing through the park turnstiles are down? Because personally I bet it's the former- Disney keeps hiking room prices and it's been getting progressively cheaper to stay offsite in a nicer property for a number of years now. If you're coming from overseas and staying 2-3 weeks, you can stretch your money a *lot* further by staying offsite. (Even with the discounts - have you seen the Expedia UK thread over on the Budget Board today?

)
Anyway this brings me back to what's going on at WDW. Why is it so overcrowded - where are all these people coming from? Has Central Florida suddenly become the only vacation destination in the US? Husband thinks it's because nobody in the southeast can afford to travel any farther away, so they're staying in CF at the Motel 6 and going to WDW. That, and there seem to be more and more tour groups every year (thank the exchange rate for that, I suspect).
I'd love to see an internal attendance chart of "through the turnstile" admissions for the last 5 years. It's gotten so crowded that last trip I rarely was able to use the bathroom without standing in a line unless it was "protected" by being inside a table service restaurant.