The Disability Discrimination Act 1995 is an Act of the Parliament of the United Kingdom which has now been repealed and replaced by the Equality Act 2010. Before the Act came into force there were several pieces of legislation to cover discrimination, including:

Sex Discrimination Act 1975
Race Relations Act 1976
Disability Discrimination Act 1995

General Facts and Figures suggest that in Britain:
Over 10 million people have a limiting long term illness, impairment or disability - this is over 18 per cent of the population.
The most common types of impairment for adults in Britain are those associated with a difficulty in mobility, lifting and carrying.
The prevalence of disability rises with age. Around 6% of children are disabled, compared to 16% of working age adults and 45% of adults over State Pension age.
Around a third of disabled people experience difficulties related to their impairment in accessing public, commercial and leisure goods and services

What do people or organisations have to do?
There are three different things people or organisations may have to do make it easier for you to access or do something.

Change the way things are done
Some people or organisations may have a certain way of doing things which makes it more difficult for you to access or do something. This could be a formal or informal policy, a rule or a practice. It could also be a one-off decision. The Equality Act calls this a provision, criterion or practice. The organisation should change these things if they are a barrier for you, unless it’s unreasonable to do so

The kind of adjustments which could be made includes removing, changing or providing a way of avoiding the physical feature, where it’s reasonable to do so. Here are examples of reasonable adjustments:
providing ramps and stairway lifts
m​​​​aking doorways wider
installing automatic doors
providing more lighting and clearer signs.