Thank you Janet - that sounds exactly as I now remember it!!
I'm plagued by doubts every time the clocks change (and have heard of more than one colleague attempting to say they weren't really an hour late, they just forgot to change their clock...) - so I imagine our manager was equally unaware of which way they were moving! - My dad (who loves a gadget at the best of times!) solved the problem in the early 90s by buying me one of those radio-controlled alarm clocks - not only did I have no excuse for not getting up on time, the thing also reset the time - all by itself - when the clocks went backwards and forwards!!