I have to go back to a fairly stressful, child unfriendly employer. I want to put in a formal flexible working request - to do down to a four day week. The hours can be long anyway and we don't get paid overtime, so I am wondering if I should ask for a ten hour working day, which would still keep me on a full time salary, or reduce my hours pro rate, so I work four days at 8 hours a week. Either would work in terms of childcare - I just want to have that one day a week clear so I can at least sometimes do school pick ups and drop offs. DO you think an employer has a preference for one or the other? I did try to ask my boss what she would prefer but just got a response asking me to fill in the request formally.