Sorry lovecheese - not at the computer for a few days.
Our school follows the National book band levels and once they get to white or lime (can't remember which - about ORT 11?) they are allowed to choose library books instead. So, my year 2 dd chooses things like those awful Rainbow fairy books, Worst Witch and that kind of thing...
About a quarter of children were free readers by the end of year 1.
However, I get the impression that schools do all these things very differently, with some schools making every child read every book in the scheme, or keeping children on a reading scheme until year 6.
Our school used mainly Rigby Star books in the upper book band levels but I think that ORT were used at an earlier stage. (Our dd learned to read quickly so we didn't really do much of the early stage - spent a lot of time on purple if I remember!)
National Book Band Levels - pink, red, yellow, blue, green, orange, turquoise, purple, gold, white, lime