you should be able to get a good deal on florida disneyland if you book early enough?
'Early enough' for Orlando this August would have been many, many months ago. To book now you could well be looking at over £1000 per person for a direct Virgin flight. Indirect, changing in some US city, would still cost c£700 each.
Hotel prices don't really change with time though, neither do theme park tickets.
Family of 4 to Orlando in August for 14 nights in a good hotel with direct flights - probably £5,000 to book now. You'll probably do another £1500 on park tickets, and you'll still need to eat and buy soft toys.