I’ve been at the company around 15 years and dropped to 3 days a week when I had our son 10 years ago. Good relationships with all staff within the company. Due to other staff movements they have asked me to change my working days slightly. My working days are stated in my contract, which states they ‘may be varied by mutual consent’. What they have asked of me is logistically difficult and will mean me attempting to change some arrangements/commitments I have on my current non-working days. Can they force me to change my days?