Hi Monica!
Welcome to planDisney.
It's always a pleasure to assist my fellow guests from the UK, and thank you for sending me this question. With the recent changes to the Disability Access Service (DAS) I am happy to clarify some of these for you.
We can organise most things from the UK in advance of our holiday. Still, every guest who wishes to register for DAS is required to have a video chat with the DAS team up to 30 days in advance of their visit. For guests from the UK, this video chat cannot be done from the UK so can only take place once you arrive in the United States at any time up until the day of your park visit. Once you are there,
please use this link to speak with a Cast Member (this will only work in the US, and you'll need to scroll down the page to find the link for a video chat).
When you are at the parks, you may use your mobile device to have this video call, but you might be more comfortable connecting from your Resort hotel room, or another more private quiet area at your hotel. You can also visit any Guest Relations at the parks where you'll find help with linking to the video chat. You can do this on the first day of your visit, or any day that suits you, to get everything organised for your stay.
Once registered, the DAS is valid for the length of your ticket or up to 240 days, whichever is shorter.
As far as I know, you do not need to show any proof of diagnosis or other documents, but if you have copies of any medical letters you can show them if you are comfortable with doing so.
I hope this explains what you need to do, but please come back and visit us again if you have any further questions -
you can also send me another direct question if you wish. If you wish to contact Disability Services before you leave for your holiday, the email address is disability.services@disneyparks.com.
Sue