It used to be that you needed have worked for the same trust for 6 months prior to falling pregnant but I think some of them have changed their policy so that you just have to have been employed by the NHS for 6 months. Again, I think this depends on which trust you work for.
With regard to the overall income, I'm not sure as I dont start maternity leave until the beginning of March but as SMP is currently just short of ??120 per week, I dont think it will be hugely different.
ds 9/4/09, Forever missing a baby boy xxx bump due 14/8/11