Consultation on Network Rail's 'Rail Utilisation Strategy' for South London officially finished on 26th October. You can view the consultation document at http://www.networkrail.co.uk/browseDirec...2895&root=
and if you want a template for responding you might wish to use the FH Society response, which you can find at http://foresthillsociety.blogspot.com/20...-rail.html

Responses should be sent to: southlondon.rus@networkrail.co.uk
South London RUS Consultation Response
National RUS Consultation Manager
Network Rail
8th Floor
40 Melton Street
London
NW1 2EE

Although the official consultation period has finished, I do not think it is too late to express your concerns regarding:
1) Reduction in trains to London Bridge from Forest Hill
2) Fewer or no direct trains to Victoria from Forest Hill
3) Cancellation of the direct trains from Forest Hill to Charing Cross off peak
4) Late introduction of longer trains on the Forest Hill route

All four points apply to Forest Hill, Sydenham and Honor Oak Park, except for the first, which does not apply to Honor Oak Park.