I think the principal concern is that the enhanced 'PRNAV' navigation system will focus aircraft effectively over Forest Hill, rather than the current vectored widespread.

I put in my postcode in Westwood Park and found the red centreline directly overhead - according to the text there will be little variation from this path for PRNAV equipped planes (albeit only about 50% will be equipped with this).

Am I the only one who actually LIKES the howling sound generated by the BA146s when they go to full flaps? Highly distinctive, and sometimes scares my country-dwelling family when visiting!