As another poster from the UK: what was the goal in testing? did you initiate it or was it the school?
[We actually don't currently live in the UK but it's looking likely we will move back there in the near future. We have IQ and achievement test results for our DD6 and she is grade skipped by three years in her current school, as well as working at university level with us in maths. But we haven't found any UK school, private or state, that has much understanding of her IQ/achievement test results. So I would be interested to hear if your results are going to be useful in developing e.g. some kind of GIEP for your DD...]