At this point in time you want to begin to sort out hotels and airport transportation this end.
Depending on how far your home is from the airport you are using, you may wish to book a hotel for the night before.
The majority of UK to Orlando flights depart at around 10am, and as you need to check-in 3-4 hours before, it is a very early morning, even if you're close.
You also may wish to book a hotel for the night you return, especially if you have a long drive home. It's not fun or very safe driving with jet lag. Flights from Orlando usually arrive back in the UK about 6am. It's something to think about it.
Airport Parking Or Transfers
If you're driving to the airport, you'll need airport parking. There is an array of websites to get this booked. You don't need to shop around too much, as most places price the parking the same. If you're not driving to the airport, and instead getting a taxi or transfer, you need to get that booked as soon as you can.