So painting the walls and woodwork?
Homebase white satin/gloss for woodwork is fine and cheaper than other brands.
You often see huge tins of good brands (like Dulux) of standard white emulsion on sale in Homebase and Wilkinsons - probably the cheapest you are going to get for the walls.
Though if your walls are already coloured one coat of white might not be enough...
Wickes is cheap too and their own-brand stuff is good.
Are you really going to paint the whole house before you move?