I have been put into a similar position. First they told me that I could not have a part-time job when I return and then they announced that they are restructuring whilst I am on maternity and so my job could disappear. I can cope with that, I suppose, but they want me to apply for my job and do an interview whilst I am on maternity leave. Apparently it would be "unfair for everyone else" if I didn't apply but I don't think they really care what is fair for me.

Anyway, I just wanted to write and say that that it isn't just you. The employer's try to screw us all over!