Hiya, just to add in from the teaching perspective from KS1...there are different ways of banding books in different schools as mentioned. My school does colours and within each colour there are two to three numbers to show the level of the book. Our colours go
pink
red,
yellow
blue
green
orange
turquoise
gold
white
emerald
This is colours based on the PM Benchmark testing for assessments (not used by all schools, but by many to assess childrens reading using running records)
"It has to be remembered that just because a child can bark at print, doesn't necessarily mean they have understood what they have read" I think that this is a very important and true statement, it is really important that they comprehend what they have read, (this is a part of the KS1 SATS)
In reference to the levels within the national curriculum assessment scheme, there is W (some schools also use P levels) but this means working towards level one, then once you get within level one, there is three sub-levels, 1C, 1B and 1A. The NC expectation for year end for a child working at an average level in year one is a 1B, this is the same for level two (Year twos are expected to acheive this).
For KS1 SATS, a child can also acheive a level three if they are working above average