Thank you everyone who gave me suggestions and solutions to my dilemma.
I've made up my mind now and the larger space to the right will combine Nanny and Nursery, to the left of the hall will be the bathroom (I had to have one as I've already got the fitments) and the far left room will be a general attic space.
The bed was originally a garish gold colour that has since been painted black.
This decision was arrived at as I already have some of the furniture, ie. Nanny's bed, washstand, crib and of course the bathroom fittings.
I'm not too keen on the low level cistern so I'll be changing that and I've yet to choose the decor of the room but at least I'm a stage further on than I was a week ago and the only thing to do next is decide which room to start with!