To give you a rough idea I've booked for 6 nights / 7 days in March staying at the Santa Fe Hotel which is a 20 mins walk from the parks and traveling from London on the direct return Eurostar.
The accomodation was £580 for two adults which includes park tickets and breakfast, and the Eurostar was £69 retrun each (£34.50 each way). So around £720 in total.
The Eurostar tickets were booked in August, 7 months before the trip to secure the cheapest price, and the hotel was booked in September during a sale.
The more up market the hotel for more expensive the cost. My tip is to sign up to the DLP website so you will get an email when the offers are on. Sometimes they will have an upto 50% flash sale which can save you hundreds of pounds.
We will be taking around £1,000 spending money for food and drink. But we have gone before for longer with half that amount in the past.
The good thing about booking direct with Disney over the phone is that when they have a flash sale you only need to pay the 20% deposit then. The rest needs to be paid 60 days before the holiday so it helps you save up and pay for the trip.
to the 
