I'm just about to paint a small bedroom for use as a nursery when my first child is born in August. I've chosen Farrow & Ball's Pale Powder but all the blurb tells me I should use one of their undercoat paints (White and Light undertones). The walls currently have Dulux Timeless (a cream colour on them), do I really need to use it or can I just paint directly onto the walls sans undercoat? It won't make that much difference will it? Please give me permission not to spend more £££s than really needed!