Regarding the effect of Age standardisation, I can't answer for the Birmingham LEA exams but I do have some actual results for the KE Foundation exams. I obtained a full print out the raw score to Age Standardisation scores for the 2005 exam from the Foundation Office.
The results are quite interesting:-
For example, in the Birmingham KE VR Tests in Nov 2004 , to achieve a Standardised Score of 118 a child aged 11.18 years on the exam day would have to achieve score 71/100, whereas a child who was only 10.22 years would only have to score 65/100. Quite a difference.
The range is similar for NVR and Numerical sections as well.
PS worthwhile registering with the site so that bulk information can exchanged via a PM.