Creating a fairer Britain
Your employer must avoid unlawful discrimination in allowing you access to facilities at work.
Use the list in avoiding direct and indirect discrimination to make sure you know what equality law says your employer must do to avoid unlawful discrimination. (no link provided)
This does not stop your employer giving you and other workers different levels of access to facilities for a reason unrelated to any protected characteristic, such as seniority within an organisation or the nature of the job you are doing.
However, your employer needs to make sure that their rules about who has access to what facilities are not in themselves unlawfully discriminatory.
An employer gives a mobile phone to use for work calls to employees who have to travel a lot for work. However, phones are only given to employees who work full-time. This has a worse impact on women who are more likely to work part-time because they are combining childcare responsibilities with their paid employment. Unless the employer can objectively justify restricting the access to this particular facility in this way, this is likely to be indirect discrimination because of sex.