Are you looking to have a short term nanny or will it be a permanent position?
I'd say you should expect to pay a minimum of £8.50 an hour, I know my qualified, experienced friends who have taken on jobs in the central belt recently are both getting more than that though.
I'm a nanny in Glasgow, not sure where in Scotland you are but there seems to be fewer jobs around at the minute, especially through agencies, parents seem to prefer going by word of mouth as it saves money and they can get a personal recommendation.
I know at least two of the three main agencies have (had?) stopped taking new nannies on their books as they are not getting enough jobs in. There are pros and cons to this situation.
What I would say is you need someone who you can trust with your baby whether your dh is there or not. I would not take on a job where the parent works from home, I agree with blondes that lots of nannies would feel this way.
My biggest bits of advice would be that when you interview potential nannies you let them hold your little one and see how she interacts and to get on with your nanny! Seems obvious but worth saying. If you just click, find her easy to talk to, have a good feeling etc it goes a long way!
Good luck