Why is there a premium on Beckenham?
Village feel - indpendent shops, coffee shops etc on the high street (independent fishmonger, sausages shop, very nice independent coffee shops and delis, two independent toy shops, home shops)
Nice parks - the rec on Croydon road is lovely, with a huge paddling pool for kids in summer, Kelsey Park is really lovely, Beckenham Place park is good for walks
Transport links cover the whole of Beckenham, with different routes into London, and the tram too
Schools are generally very good. Balgowan is outstanding (tiny catchment though, despitye being three form entry), and other excellent schools (I don't know about secondary)
Supermarkets - Waitrose, M&S food and Sainsburys
Beckenham Spa is the local leisure centre which has kids pool and really good swimming pool with gallery, gym facilities and soft play too.
Library is nect to the Spa and is very good
Gambados has excellent soft play
Local cricket club, tennis and lots of other sports going on competitvely and for leisure
Beckenham is large, and there will be housing stock in every price bracket
( I don't live there btw! I used to, and loved it.)