Due to COVID-19, the majority of Walt Disney World holidays in 2020 for UK guests have been cancelled. Disney pulled sale of hotels and tickets for the rest of 2020. However, starting August 25th, Disney are selling holiday packages again for 2020, with a few tweaks.
The 7/14/21 Ultimate Ticket is still not available to purchase for 2020. Instead, you'll be offered Flexible Date Base Tickets. These tickets allow you to enjoy one theme park per day. You can buy a 1 day, 4 day, or 7 day flexible date base ticket. Park hopping is not available. A theme park reservation will still have to be made to get access to the theme parks.