Early guidance has been published by the Government on Disabled access to the lying in state. You can access this here. Full guidance will be released at 10pm on Tuesday 13 September on the same web link.
More information is available on Royal Family and Government websites.
Edit 16/09/22:
The Department for Culture, Media and Sport has now confirmed to DR UK that a Changing Places will be available at the Tate Britain site, and food and drink will be available at first aid stations within the Palace grounds.
A first aid point has also been set up at Tate Britain. There is a large waiting space at the wristband allocation point at Tate Britain, plus an on site bag drop.
Disabled visitors still have to wait as long as the main queue (on Friday morning, stewards were saying 11 hours) but can wait away from the queue. This means that late afternoon and evening visitors may be waiting without proper rest places, and may find travelling difficult as train and tube routes close down overnight, and buses run as less frequent night buses.
DR UK sent a representative to test the accessibility queue on Thursday evening. The wristband queue at this time (subject to change) was around half an hour. A wristband was issued at 8pm for 5-6am Friday morning. Entrance to the Palace for the morning slot was swift, but necessitated a nine hour overnight wait in the capital.
