I have chosen one of your prefinished oak floors. Are the stair treads, nosings and oak transitions the same material or do I have to colour match by hand oiling?

No, all these components use the same prefinished oak product you have chosen. Our oak flooring manufacturer also makes the stair treads, nosing etc for us. So they will be a perfect match! If you have chosen an unfinished floor, you will need to use the same oil used on the floor for the stair treads, nosings and oak transitions.