On the meaning of 1:1, this is from the Bucks council website:
Headteachers of state funded Buckinghamshire primary or Partner schools are asked – before the test results are known – whether they would recommend your child for a grammar school. They also provide information about your child’s attitude to learning. If your child attends any other school, your child’s headteacher will have the opportunity to add their recommendation as part of the Headteacher’s Selection Review Summary Sheet.
The headteacher can give a child’s grammar school suitability recommendation as:
(1) Exceptionally able so very highly recommended, or;
(2) Very able so recommended without any reservation, or;
(3) Recommended with reservation, or;
(4) Not recommended for grammar school.
Your child’s attitude to learning will be described as:
(1) Enjoys a challenge and is a highly motivated independent learner, or;
(2) Consistently hard working and reliable, or;
(3) Output varies, or;
(4) Lacks self-organisation, requires support.
This information is valued by the SRP, because it gives them an idea of the context in which your child is working in school. It can also help to show if a child’s result was unexpected when compared to their recommendation.