@Delectable
Over £1m in Aylesbury will be almost impossible! Some enlarged estate house might be that but Aylesbury in general doesn’t have this sort of property. You would t want to live there either! And I know it well!
You need to look at Bucks CC web site on secondary schools. I can name them all but you could look up where they are in the towns! Bucks has only 13 grammars so it won’t take long!
As I said, the bigger issue is secondary schools. For clarity the girls grammars are Beaconsfield High, Aylesbury High, Wycombe High and Aylesbury High. There are several co Ed such as Chesham Grammar, Royal Latin School, Sir Henry Floyd & Sir William Borlase. You need to look up catchment areas on the Bucks web site. However if you wanted Aylesbury High school, you could live in one of the villages and commute from Aylesbury or Stoke Mandeville or Wendover. You could look at Wing where you have The Cottesloe Secondary and commute from Leighton Buzzard. DD could go to Aylesbury High.
Secondary schools that are sought after are: Waddesdon, John Colet, The Misbourne, The Amersham School - others are perfectly ok. Again check catchment because Waddesdon is a tiny catchment.
All primary schools mostly take all catchment children. However they don’t prep for the 11 plus other then teach the curriculum. Bright DC will get enhanced work within the curriculum. This is not the same as doing 11 plus style questions or timed papers under pressure.
Thame in Oxfordshire has Lord Williams School which is a popular comp and Tring in Herts has Tring School which is also good. If you chose to live in Bucks and you pass 11 plus, you will get a grammar school place but not necessarily first choice.
Do look at the Bucks schools web site it is very comprehensive and detailed.