Approximately 8years ago I applied for and had approved a flexible working request. It wasn't a major request but simply asked to work a Saturday rather than a regular weekday evening ie every week with everything else the same ie 37.5 hours per week. Since then this has been implemented although the requirement to work Saturdays has reduced and it's only 6 times a year and I do an occasional ie 6 times per year weekday evening to cover for a colleague and this is planned in advance by 4 plus months.
Yesterday I was informed that my flexible working agreement was being rejected now and that if I wanted to not work a regular evening I would have to apply again. HR have said its down to a change in the law and that if I apply I may not get approval.
I am the primary carer to my children with my husband working away during the week and this has worked well for all colleagues as not many of them wish to work on a Saturday if required.
Any thoughts on how to approach this and whether it's legal to do this. Also I can't find what law change this could be.