This may be of interest to women in particular!
https://www.acas.org.uk/about-us/acas-consultations/code-of-practice-flexible-working-requests-2023
'The Department for Business and Trade (DBT) is currently legislating to reform the flexible working provisions set out in the Employment Rights Act 1996. In response to these changes, Acas is updating its statutory Code of Practice on handling in a reasonable manner requests to work flexibly.
The updated draft Acas Code is intended to provide employers, employees and representatives with good practice advice on how the new flexible working rules should work in practice. Statutory Codes of Practice are not legally binding, but they are taken into account by courts and employment tribunals when considering relevant cases.'