Under laws that control water restrictions/hosepipe bans, there are no special exemptions for anyone over 65, disabled people and disabled blue badge holders. So these groups still have to stick to the hosepipe ban in the eyes of the law.
However, all water companies are allowed to make their own exceptions to the rules. At the time of writing, most water companies are exempting anyone who has a disabled person’s badge (known as a “blue badge”) issued under the Disabled Persons (Badges for Motor Vehicles) (England) Regulations 2000. Note that this exemption is purely for the use of a hosepipe when watering a garden.
See our pages on individual water companies for more details.