There seems to be a glitch on the website. Based on a Family of 4 It's allowing you to book 5 nights for the same price of 2 nights including tickets to Legoland for 3 days, carpark passes, hotel and breakfast for 5 nights. The hotel is Holiday Inn Express Slough also 6 miles away from Legoland. This seems to be a steal compared to others listed. The best thing is its during school Holidays.
Above doesn't include £12 for carpark but shows dates!