I would really appreciate advice from any decorators out there. We are renovating a period house. We love the farrow and ball range but it is incredibly expensive. The rooms are big and there is a lot of wall space to be painted. Some people seem to mix Dulux paints to try and get similar colours to the F&B range. Does this work? I would not expect the colour mixes to be identical but can you get pretty close? the Is there any other brand you would recommend which do nice period type colours and covers well? many thanks.