OK, so it's only a small change - normally I work 3 days (6 sessions) a week, start early and finish fairly early - have done so since I joined the place 15 months ago. My contract only states my total hours. Yesterday I just happened to look at my rota for the new year - now on one day every fortnight I am down to start late and finish late - totally shocked to see it as no-one has told me about any change. In fact a couple of months ago I told my employer that I was very happy with my hours as they were and they seemed to accept that. Went to discuss with management today but they are all on holiday due to Christmas. I am now not back in the building till new year and my first day back should be on the late/late rota, so if I hadn't happened to look I would have come into work at the wrong time and could have also made unsuitable arrangements. I feel quite angry - do you think I am justifiedhow should I tackle this?