My 2 younger children are at Bowdon Church School (Y4 and Y6) - My DD passed for AGGS and is in Y8 and my Son passed for AGSB this exam year just gone. They have a very good record of getting children into the Grammars and have just been classed as the 2nd best performing Primary School in the U.K (I know there are several ways to calculate this).
Here is the link for you to read through below.http://www.telegraph.co.uk/education/le ... kings.html
Importantly - the School are about to expand and increase the classes to 3 for each year, and there are also plans for a new build - http://www.trafford.gov.uk/residents/ed ... chool.aspx
The School really does focus on academic learning (mainly from junior level) - but it equally focuses really hard on social learning, music and sports - as such I would recommend you trying hard to get into its catchment area (the downside is that property is expensive locally).
The local area also has more outstanding primary Schools nearby (like the Bollin for example), so all in all a great place to start your search.
Hope this helps, feel free to PM me for any further help.
And good luck....We moved to Bowdon from Urmston when our DD was one year old for exactly the same reasons, and it has been worth every penny we had to spend to move to the area, for many different reasons!