Thanks for your replies. I do see the benefit of the 4 beds, even for ourselves but I did wonder whether people expect the wow factor with refurbished victorian houses i.e. huge bedrooms and bathrooms?
No option to extend into attic, the house has low double pitched roof.
We could possibly fit an ensuite on the largest bedroom. If we did this and extended the main bathroom into the other two rooms I was concerned that none of the bedrooms would be very big. But then what is more desirable: 3 good size bedrooms, one with ensuite and large main bathroom OR 4 average size rooms (one ensuite) and average size bathroom.