Specifically the train line between Woking and London Waterloo. Includes places like wimbledon, new waldon, vauxhall, and surbubiton. Tried google but most of the results are very commercial and you often end up not being able to view or answer adverts without paying a fee. I have used and exhausted gumtree but was hoping someone might know of some other ones
http://www.spareroom.co.uk is free for all adverts over 7 days old, but you do have to pay £7 for 1 weeks use to respond to all adverts less than a week old.