There's another way to make a protest against TfL or Southern Trains - hit them where it hurts, in the pocket.

This only applies to monthly and annual season ticket holders, though.

Annoyed with TfL and their empire building ways? Then do not renew your season ticket at Forest Hill or Honor Oak Park. Renew it at London Bridge. Southern Trains will receive the revenue they lost after handing over FH/HOP to TfL.

Annoyed with Southern reducing services? Renew your season ticket at a non-Southern or a non-SouthEast train station (both are owned by the same company). Like Waterloo (SouthWest Trains).

All TOCs will sell you season tickets for anywhere in the country at the same price even if you don't use their trains, as I was told by the helpful lady at SouthWest. I only know this after FirstGreatWestern took ?3K out of my account without giving me a season ticket. This made me a bit angry. So, I got my money back and gave it to SouthWest in exchange for a season ticket.