Never used Crown, always thought their rates were too good to be true and never liked the fact that you can wait weeks if you want the better rate. Use Thomas Exchange myself but again don't know how secure they are but they have been going since 1978 and are based in the City and vetted by HMRC for money laundering.
Get my Theme Park tickets from Wallmart, usually good price and get the tickets in your hand when you pass over the cash or credit card.
Seems to be a few on here looking at Florida. I can do you a good deal on a 4 Bed/ 2 Bath villa with its own pool less than 10 minutes from Disney and provide advice on car hire, theme parks etc. TRB has stayed there so can vouch for the place.