This type of discrimination occurs when a disabled person is treated less favourably because of something connected with their disability and this unfavourable treatment cannot be justified.
The only justification to this discriminatory conduct would be if there exists a genuine legitimate objective that will be met in a fair, objective and reasonable way.
Discrimination arising from disability can only occur if it is known that a person has a disability or it can be reasonably expected that a person is disabled.
For example, Vikram, who has an assistance dog, is not allowed to enter his local mobile library because staff say there is not enough room for his dog. This may be discrimination arising from disability unless it can be justified (e.g. the dog poses a genuine health and safety risk as opposed to merely being inconvenient for staff).